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A massive security operation today came into force in central London as protesters said up to 250,000 demonstrators will take to the streets to “disrupt” President Trump’s visit.

Scotland Yard placed streets surrounding Buckingham Palace and Downing Street in “lockdown” with around 10,000 police officers deployed in the capital in a £25 million operation.

Hundreds of uniformed officers were in position this morning, while several roads in the centre including The Mall were closed to traffic for two days.

Workers have put huge numbers of metal security barriers in place, preventing the usual crowd of tourists from gathering in front of the Queen’s London home.

2018 Trump Protests in London - In pictures 41 show all 2018 Trump Protests in London - In pictures 1/41 Demonstrators gather in Trafalgar Square, London during a 'Stop Trump' march as part of the protests against the visit of US President Donald Trump to the UK. PA 2/41 Tens of thousands of people take part in a Stop Trump Coalition - Stop the War Protest against the US President Donal J. Trump visit at Trafalgar Square in London EPA 3/41 'Stop Trump' demonstrators gather in Trafalgar Square after marching through London PA 4/41 Tens of thousands of people marched today in protest at Donald Trump's UK visit Reuters 5/41 'Stop Trump' demonstrators gather in Trafalgar Square after marching through London PA 6/41 'Stop Trump' demonstrators march through Regent Street in London PA 7/41 The protesters took to the streets in anger at the US president's controversial visit PA 8/41 'Stop Trump' demonstrators gather in Trafalgar Square after marching through London PA 9/41 Protestors hold banners during the 'Stop Trump' Women's March in London AP 10/41 Donald Trump earlier gave a bombshell interview with the Sun in which he criticised the Prime Minister's approach on Brexit Reuters 11/41 'Stop Trump' demonstrators march through Regents Street in London PA 12/41 Demonstrators also inflated a blimp effigy of Donald Trump PA 13/41 An aerial view of the women's march in progress AP 14/41 Donald Trump will meet the Queen later on today Getty Images 15/41 Protesters for the 'Stop Trump' Women's March hold banners in London AP 16/41 Thousands more people are expected to march later on Reuters 17/41 As many as 70,000 people took to the streets Getty Images 18/41 People held aloft placards that read: "Trump Not Welcome" Reuters 19/41 Bianca Jagger joins protesters for the 'Stop Trump' Women's March in London PA 20/41 The protesters hold balloons with anti-Trump messages on them Reuters 21/41 Trump's visit was criticised heavily PA 22/41 'Stop Trump' demonstrators march through Oxford Circus PA 23/41 Tens of thousands of people take part in a Stop Trump protest EPA 24/41 Protesters gather in central London to demonstrate against President Trump's visit to the UK Getty Images 25/41 A drag queen joins protesters against the UK visit of US President Donald Trump AFP/Getty Images 26/41 Huge crowd: a bigger protest is due later today AP 27/41 Protesters for the 'Stop Trump' Women's March pass along Whitehall in London PA 28/41 Protesters against the UK visit of US President Donald Trump hold up placards as they take part in a march and rally in London AFP/Getty Images 29/41 James O'Brien sells Donald Trump toilet paper, as part of the protests against the visit of US President Donald Trump to the UK PA 30/41 Demonstrators protest against the visit of US. President Donald Trump Reuters 31/41 A man dressed as President Trump poses for a photograph as protesters against the UK visit of US President Donald Trump AFP/Getty Images 32/41 Protesters for the 'Stop Trump' Women's March pass along Whitehall in London PA 33/41 Protesters for the 'Stop Trump' Women's March pass near to Trafalgar Square in London PA 34/41 Protesters join a Women's march in central London to demonstrate against President Trump's visit to the UK Getty Images 35/41 Tens of thousands of people take part in a Stop Trump Coalition - Stop the War Protest against the US President Donald J. Trump visit in London EPA 36/41 Drag queens take part in the Drag Against Trump protest in Piccadilly Circus EPA 37/41 Drag queens take part in the Drag Against Trump protest in Piccadilly Circus EPA 38/41 The "Trump Baby" balloon joins demonstrators as they march to Parliament Square in London PA 39/41 Demonstrators protest against the visit of US President Donald Trump REUTERS 40/41 Tens of thousands of people take part in a Stop Trump Coalition - Stop the War Protest against the US President Donal J. Trump visit in London EPA 41/41 Tens of thousands of people take part in a Stop Trump Coalition - Stop the War Protest against the US President Donal J. Trump visit in London EPA 1/41 Demonstrators gather in Trafalgar Square, London during a 'Stop Trump' march as part of the protests against the visit of US President Donald Trump to the UK. PA 2/41 Tens of thousands of people take part in a Stop Trump Coalition - Stop the War Protest against the US President Donal J. Trump visit at Trafalgar Square in London EPA 3/41 'Stop Trump' demonstrators gather in Trafalgar Square after marching through London PA 4/41 Tens of thousands of people marched today in protest at Donald Trump's UK visit Reuters 5/41 'Stop Trump' demonstrators gather in Trafalgar Square after marching through London PA 6/41 'Stop Trump' demonstrators march through Regent Street in London PA 7/41 The protesters took to the streets in anger at the US president's controversial visit PA 8/41 'Stop Trump' demonstrators gather in Trafalgar Square after marching through London PA 9/41 Protestors hold banners during the 'Stop Trump' Women's March in London AP 10/41 Donald Trump earlier gave a bombshell interview with the Sun in which he criticised the Prime Minister's approach on Brexit Reuters 11/41 'Stop Trump' demonstrators march through Regents Street in London PA 12/41 Demonstrators also inflated a blimp effigy of Donald Trump PA 13/41 An aerial view of the women's march in progress AP 14/41 Donald Trump will meet the Queen later on today Getty Images 15/41 Protesters for the 'Stop Trump' Women's March hold banners in London AP 16/41 Thousands more people are expected to march later on Reuters 17/41 As many as 70,000 people took to the streets Getty Images 18/41 People held aloft placards that read: "Trump Not Welcome" Reuters 19/41 Bianca Jagger joins protesters for the 'Stop Trump' Women's March in London PA 20/41 The protesters hold balloons with anti-Trump messages on them Reuters 21/41 Trump's visit was criticised heavily PA 22/41 'Stop Trump' demonstrators march through Oxford Circus PA 23/41 Tens of thousands of people take part in a Stop Trump protest EPA 24/41 Protesters gather in central London to demonstrate against President Trump's visit to the UK Getty Images 25/41 A drag queen joins protesters against the UK visit of US President Donald Trump AFP/Getty Images 26/41 Huge crowd: a bigger protest is due later today AP 27/41 Protesters for the 'Stop Trump' Women's March pass along Whitehall in London PA 28/41 Protesters against the UK visit of US President Donald Trump hold up placards as they take part in a march and rally in London AFP/Getty Images 29/41 James O'Brien sells Donald Trump toilet paper, as part of the protests against the visit of US President Donald Trump to the UK PA 30/41 Demonstrators protest against the visit of US. President Donald Trump Reuters 31/41 A man dressed as President Trump poses for a photograph as protesters against the UK visit of US President Donald Trump AFP/Getty Images 32/41 Protesters for the 'Stop Trump' Women's March pass along Whitehall in London PA 33/41 Protesters for the 'Stop Trump' Women's March pass near to Trafalgar Square in London PA 34/41 Protesters join a Women's march in central London to demonstrate against President Trump's visit to the UK Getty Images 35/41 Tens of thousands of people take part in a Stop Trump Coalition - Stop the War Protest against the US President Donald J. Trump visit in London EPA 36/41 Drag queens take part in the Drag Against Trump protest in Piccadilly Circus EPA 37/41 Drag queens take part in the Drag Against Trump protest in Piccadilly Circus EPA 38/41 The "Trump Baby" balloon joins demonstrators as they march to Parliament Square in London PA 39/41 Demonstrators protest against the visit of US President Donald Trump REUTERS 40/41 Tens of thousands of people take part in a Stop Trump Coalition - Stop the War Protest against the US President Donal J. Trump visit in London EPA 41/41 Tens of thousands of people take part in a Stop Trump Coalition - Stop the War Protest against the US President Donal J. Trump visit in London EPA

Activists were expected to assemble outside Buckingham Palace this afternoon before the Queen hosts a state banquet for Mr Trump - with protesters vowing to do all they can to “disrupt” the occasion.

An eight foot ring of steel has also been erected around the US Ambassador’s residence Winfield House, near Regent’s Park, where Mr Trump is staying during the visit.

The main demonstration against the President is scheduled for tomorrow when as many as 250,000 protesters – including a raft of senior Labour MPs - are due to march through from Trafalgar Square to Downing Street.

A section of Whitehall will be closed tomorrow for security reasons.

A spokeswoman for the Stomp Trump Coalition said: “The point of these protests is to get that message across very clearly and ultimately, to disrupt Trump’s visit.

“We want him to know he’s not welcome. We also want the UK government to appreciate that, not only is a state visit for a hate monger like Trump totally inappropriate, but that when it comes to Trumpism in our own country there is a movement of people ready to fight back.”

The protest will feature a return of the giant 20ft inflatable nappy-wearing Donald Trump baby blimp, which has been given the go-ahead by Mayor of London Sadiq Khan and the Civil Aviation Authority to fly over Parliament Square for two hours from 9am tomorrow.

A 16ft talking robot of Mr Trump sitting on a gold toilet is also expected to make an appearance.

Labour shadow ministers Dawn Butler, Emily Thornberry and Diane Abbott are expected to be among those who turn out for the protests.

“We would like this to be the biggest demonstration in British history,” said Shabbir Lakha, organiser of the Stand Up to Trump coalition, which is supported by bodies including Unite, the National Union of Teachers and the Campaign Against Climate Change.

“We want to show our opposition visibly and vocally, giving people an opportunity to come out and show their dissent.”

Scotland Yard said it had asked for re-inforcements from other police forces around the UK for help in policing the three day visit.

Around 250,000 anti-Trump activists gathered when Mr Trump flew into the UK on 13 July 2018 for his first visit as US president.

Mr Lakha added the plan was to fill Trafalgar Square, Whitehall and Embankment, “effectively surrounding” the areas where Mr Trump would be visiting.

“We are going to be assembling in Trafalgar Square and will march down Whitehall, with a rally at the Monument to the Women of World War II next to the Cenotaph, which should be at the same time Donald Trump is in Downing Street,” he said.

Co-ordinated groups will arrive from around the UK’s cities, including Bristol, Newcastle, Durham, and York, as well as the West Midlands and Wales.

Donald Trump's state visit to the UK: June 2019 - In pictures 86 show all Donald Trump's state visit to the UK: June 2019 - In pictures 1/86 Prime Minister Theresa May and US President Donald Trump during their joint press conference at the Foreign & Commonwealth Office in London PA 2/86 The US president raised a toast to the Queen during his speech PA 3/86 Anti-Trump protesters with a Trump baby blimp flying over Parliament Square gather for a protest against US President Donald J. Trump State visit to the UK EPA 4/86 Donald and Melania Trump arrive at Stansted Airport AP 5/86 Melania Trump, US President Donald Trump and Prime Minister Theresa May leave 10 Downing Street for the Foreign and Commonwealth Office during the second day of his State Visit Getty Images 6/86 US President Donald Trump and Prime Minister Theresa May give a joint press conference at the Foreign and Commonwealth office in London Sky News 7/86 Philip May, husband of British Prime Minister and US First Lady Melania Trump talk with children as they attend a garden party at 10 Downing street in London EPA 8/86 US First Lady Melania Trump attends a garden party at 10 Downing street with Philip May, husband of British Prime Minister in London EPA 9/86 Philip May, husband of British Prime Minister and US First Lady Melania Trump pose with children as they attend a garden party at 10 Downing street in London EPA 10/86 U.S. President Donald Trump and Prime Minister Theresa May at Downing Street Jeremy Selwyn 11/86 Philip May, British Prime Minister Theresa May, US President Donald Trump and First Lady Melania Trump arrive at 10 Downing street for a meeting on the second day of the U.S. President and First Lady's three-day State visit Getty Images 12/86 U.S. President Donald Trump attends a business roundtable discussion at St James's Palace during his state visit in London Reuters 13/86 Anti-Trump demonstrators inflate a giant balloon depicting US President Donald Trump as an orange baby in Parliament Square AFP/Getty Images 14/86 US President Donald Trump speaks at a business roundtable discussion at St. Jamess Palace in London AFP/Getty Images 15/86 Mr Trump praises the Queen during a speech at the event PA 16/86 Donald Trump, The Queen, Melania Trump, The Prince of Wales and the Duchess of Cornwall attend the event at Buckingham Palace. PA 17/86 Mr Trump and the Queen walk into the state banquet together AFP/Getty Images 18/86 The Queen, the First Lady Melania Trump and Donald Trump pose together at the state banquet AFP/Getty Images 19/86 The Queen views a display of US items of the Royal collection with US President Donald Trump and US First Lady Melania Trump at Buckingham Palace AFP/Getty Images 20/86 Prince Andrew, Duke of York with US President Donald Trump and First Lady Melania Trump at the Grave of the Unknown Warrior Getty Images 21/86 U.S. President Donald Trump and First Lady Melania Trump place a wreath at Westminster Abbey as part of their state visit in London Reuters 22/86 A message from U.S. President Donald Trump and First Lady Melania Trump is seen in a guest book after they toured Westminster Abbey as part of their state visit in London Reuters 23/86 Soldiers with a wreath that US President Donald Trump and First Lady Melania Trump will lay at the Grave of the Unknown Warrior during their visit to Westminster Abbey Getty Images 24/86 US President Donald Trump and First Lady Melania Trump pay their respects at the Tomb of the Unknown Warrior in Westminster Abbey Getty Images 25/86 US President Donald Trump and First Lady Melania Trump lay a wreath at the Grave of the Unknown Warrior during their visit to Westminster Abbey Getty Images 26/86 Jared Kushner and Ivanka Trump arrive at Westminster Abbey AP 27/86 Ivanka Trump (L) and Britain's Prince Harry, Duke of Sussex view displays of US items of the Royal Collection at Buckingham Palace AFP/Getty Images 28/86 The Queen views a display of US items of the Royal collection with US President Donald Trump and US First Lady Melania Trump at Buckingham Palace AFP/Getty Images 29/86 U.S. President Donald Trump, First Lady Melania Trump and Britain's Queen Elizabeth review items from the Royal Collection at Buckingham Palace, Reuters 30/86 Ivanka Trump and her husband Senior Advisor to the President of the United States Jared Kushner view displays of US items of the Royal Collection with Prince Andrew, Duke of York at Buckingham Palace AFP/Getty Images 31/86 Ivanka Trump and her husband Senior Advisor to the President of the United States Jared Kushner view displays of US items of the Royal Collection with Britain's Prince Andrew, Duke of York at Buckingham Palace AFP/Getty Images 32/86 Prince Harry, Duke of Sussex looks on as US President Donald Trump views US items of the Royal Collection at Buckingham palace AFP/Getty Images 33/86 U.S. President Donald Trump with The Queen and US First Lady Melania Trump during the welcome ceremony at Buckingham Palace Jeremy Selwyn 34/86 The car carrying U.S President Donald Trump leaves Buckingham Palace AP 35/86 People outside Buckingham Palace during U.S. President Donald Trump's state visit to Britain REUTERS 36/86 US President Donald Trump and US First Lady Melania Trump travel along the mall in their motorcade after leaving Buckingham Palace AFP/Getty Images 37/86 Royal guards march down Birdcage Walk on route to Westminster Abbey PA 38/86 British armed police officers patrol streets at Westminster Abbey EPA 39/86 US First Lady Melania Trump smileS with The Queen and Camilla, Duchess of Cornwall Jeremy Selwyn 40/86 U.S. President Donald Trump meets The Queen at Buckingham Palace Jeremy Selwyn 41/86 US President Donald Trump and his wife Melania are welcomed by Queen Elizabeth II, The Prince of Wales and The Duchess of Cornwall during the welcome ceremony at Buckingham Palace PA 42/86 U.S. President Donald Trump meets Prince Charles Jeremy Selwyn 43/86 The Queen Elizabeth, President Donald Trump, first lady Melania Trump, Britain's Prince Charles and Camilla, Duchess of Cornwall, listen to the US national anthem during a ceremonial welcome in the garden of Buckingham Palace AP 44/86 US President Donald Trump flanked by Britain's Prince Charles, Prince of Wales inspects an honour guard during a welcome ceremony at Buckingham Palace AFP/Getty Images 45/86 Members of the King's Troop Royal Horse Artillery fire a 82-gun double gun salute in Green Park AFP/Getty Images 46/86 U.S. President Donald Trump meets The Queen at Buckingham Palace Jeremy Selwyn 47/86 U.S. President Donald Trump meets Britain's Prince Charles as he arrives at Buckingham Palace Reuters 48/86 Camilla, Duchess of Cornwall greets First Lady Melania Trump Jeremy Selwyn 49/86 Camilla, Duchess of Cornwall and Prince Charles, Prince of Wales greet US President Donald Trump and US First Lady Melania Trump on their arrival for a welcome ceremony at Buckingham Palace AFP/Getty Images 50/86 The Queen Elizabeth waits to greet President Donald Trump and first lady Melania Trump as they walk up the steps with Britain's Prince Charles, right, and Camilla, Duchess of Cornwall AP 51/86 Marine One lands as U.S. President Donald Trump and First Lady Melania Trump arrive at Buckingham Palace, Reuters 52/86 Ivanka Trump looks out of the window at Buckingham Palace ahead of the visit of US President Donald Trump and First Lady Melania Trump Getty Images 53/86 Armed police lock down central London ahead of US President Donald J. Trump's visit to Westminster Abbey in London EPA 54/86 A supporter of the U.S. President Donald Trump argues with police officers outside Buckingham Palace during the state visit of U.S. President Donald Trump and First Lady Melania Trump to Britain Reuters 55/86 A protester outside Buckingham Palace PA 56/86 A changing of the guard takes place outside Buckingham Palace, London, during the first day of a state visit to the UK by US President Donald Trump PA 57/86 The Mall towards Buckingham Palace in the early morning which is decked with American Stars and Stripes and Union Jacks ahead of the State Visit of US President Donald Trump who arrives today for a 3 day state visit Rex Features 58/86 Police officers survey the area from the roof of Buckingham Palace AFP/Getty Images 59/86 A vehicle with a US number plate enters Buckingham Palace PA 60/86 A member of the public holds up a welcome sign outside Buckingham Palace, London PA 61/86 A U.S. helicopter lands at Buckingham Palace during U.S. President Donald Trump's state visit to Britain in London Reuters 62/86 @born_eco shares an image of a message for Trump which had been mowed into a lawn under the flight path of Air Force One @born_eco 63/86 Amnesty International install 'Resist Trump' banners on Vauxhall Bridge following the arrival of US President Donald Trump Getty Images 64/86 A Marine One helicopter lands near Winfield House during U.S. President Donald Trump's state visit to Britain Reuters 65/86 People wait in front of Buckingham Palace during the state visit of U.S. President Donald Trump and First Lady Melania Trump to Britain, Reuters 66/86 Police officers stand alongside their vehicles at Stansted airport in Essex ahead of the arrival there of US President Donald Trump and his wife Melania, aboard Air Force One, for the start of his three day state visit to the UK PA 67/86 U.S. President Donald Trump and First Lady Melania Trump arrive aboard Air Force One for their state visit to Britain, Reuters 68/86 Foreign Secretary Jeremy Hunt greets US President Donald Trump as he arrives at Stansted Airport Getty Images 69/86 President Donald Trump salutes an honor guard as he and first lady Melania Trump arrive at Stansted Airport AP 70/86 Air Force One lands carrying U.S. President Donald Trump and First Lady Melania Trump arriving for their state visit to Britain, at Stansted Airport AFP/Getty Images 71/86 US President Donald Trump (R) and US First Lady Melania Trump (L) disembark Air Force One at Stansted Airpor AFP/Getty Images 72/86 U.S. President Donald Trump boards Marine One as he arrives for his state visit to Britain, at Stansted Airport Reuters 73/86 A helicopter is seen over the skyline of London during the state visit of U.S. President Donald Trump and First Lady Melania Trump to Britain Reuters 74/86 Police and security personnel survey the area from the top of Winfield House, the residence of the US Ambassador in London AFP/Getty Images 75/86 Air Force One lands carrying U.S. President Donald Trump and First Lady Melania Trump arriving for their state visit to Britain, at Stansted Airport Reuters 76/86 Air Force One lands carrying U.S. President Donald Trump and First Lady Melania Trump arriving for their state visit to Britain, at Stansted Airport Reuters 77/86 Police officers patrol The Mall Rex Features 78/86 Guards wait before U.S. President Donald Trump and First Lady Melania Trump arrive for their state visit to Britain Reuters 79/86 Air Force One lands at Stansted airport in Essex Sky News 80/86 Air Force One lands carrying U.S. President Donald Trump and First Lady Melania Trump Reuters 81/86 Police officers stand alongside their vehicles at Stansted airport in Essex PA 82/86 Air Force Two arrives at Stansted Airport in Essex, for the start of a three day state visit to the UK by the US President Donald Trump and first lady Melania PA 83/86 Air Force One lands carrying U.S. President Donald Trump and First Lady Melania Trump arriving for their state visit to Britain, at Stansted Airport Reuters 84/86 Donald Trump called Sadiq Khan a "shorter" twin of Bill de Blasio. AFP/Getty Images 85/86 US President Donald Trump and First Lady Melania Trump stepped off Marine One and make their way to board Air Force One as they flew off to the UK AFP/Getty Images 86/86 President Donald Trump and First Lady Melania Trump EPA 1/86 Prime Minister Theresa May and US President Donald Trump during their joint press conference at the Foreign & Commonwealth Office in London PA 2/86 The US president raised a toast to the Queen during his speech PA 3/86 Anti-Trump protesters with a Trump baby blimp flying over Parliament Square gather for a protest against US President Donald J. Trump State visit to the UK EPA 4/86 Donald and Melania Trump arrive at Stansted Airport AP 5/86 Melania Trump, US President Donald Trump and Prime Minister Theresa May leave 10 Downing Street for the Foreign and Commonwealth Office during the second day of his State Visit Getty Images 6/86 US President Donald Trump and Prime Minister Theresa May give a joint press conference at the Foreign and Commonwealth office in London Sky News 7/86 Philip May, husband of British Prime Minister and US First Lady Melania Trump talk with children as they attend a garden party at 10 Downing street in London EPA 8/86 US First Lady Melania Trump attends a garden party at 10 Downing street with Philip May, husband of British Prime Minister in London EPA 9/86 Philip May, husband of British Prime Minister and US First Lady Melania Trump pose with children as they attend a garden party at 10 Downing street in London EPA 10/86 U.S. President Donald Trump and Prime Minister Theresa May at Downing Street Jeremy Selwyn 11/86 Philip May, British Prime Minister Theresa May, US President Donald Trump and First Lady Melania Trump arrive at 10 Downing street for a meeting on the second day of the U.S. President and First Lady's three-day State visit Getty Images 12/86 U.S. President Donald Trump attends a business roundtable discussion at St James's Palace during his state visit in London Reuters 13/86 Anti-Trump demonstrators inflate a giant balloon depicting US President Donald Trump as an orange baby in Parliament Square AFP/Getty Images 14/86 US President Donald Trump speaks at a business roundtable discussion at St. Jamess Palace in London AFP/Getty Images 15/86 Mr Trump praises the Queen during a speech at the event PA 16/86 Donald Trump, The Queen, Melania Trump, The Prince of Wales and the Duchess of Cornwall attend the event at Buckingham Palace. PA 17/86 Mr Trump and the Queen walk into the state banquet together AFP/Getty Images 18/86 The Queen, the First Lady Melania Trump and Donald Trump pose together at the state banquet AFP/Getty Images 19/86 The Queen views a display of US items of the Royal collection with US President Donald Trump and US First Lady Melania Trump at Buckingham Palace AFP/Getty Images 20/86 Prince Andrew, Duke of York with US President Donald Trump and First Lady Melania Trump at the Grave of the Unknown Warrior Getty Images 21/86 U.S. President Donald Trump and First Lady Melania Trump place a wreath at Westminster Abbey as part of their state visit in London Reuters 22/86 A message from U.S. President Donald Trump and First Lady Melania Trump is seen in a guest book after they toured Westminster Abbey as part of their state visit in London Reuters 23/86 Soldiers with a wreath that US President Donald Trump and First Lady Melania Trump will lay at the Grave of the Unknown Warrior during their visit to Westminster Abbey Getty Images 24/86 US President Donald Trump and First Lady Melania Trump pay their respects at the Tomb of the Unknown Warrior in Westminster Abbey Getty Images 25/86 US President Donald Trump and First Lady Melania Trump lay a wreath at the Grave of the Unknown Warrior during their visit to Westminster Abbey Getty Images 26/86 Jared Kushner and Ivanka Trump arrive at Westminster Abbey AP 27/86 Ivanka Trump (L) and Britain's Prince Harry, Duke of Sussex view displays of US items of the Royal Collection at Buckingham Palace AFP/Getty Images 28/86 The Queen views a display of US items of the Royal collection with US President Donald Trump and US First Lady Melania Trump at Buckingham Palace AFP/Getty Images 29/86 U.S. President Donald Trump, First Lady Melania Trump and Britain's Queen Elizabeth review items from the Royal Collection at Buckingham Palace, Reuters 30/86 Ivanka Trump and her husband Senior Advisor to the President of the United States Jared Kushner view displays of US items of the Royal Collection with Prince Andrew, Duke of York at Buckingham Palace AFP/Getty Images 31/86 Ivanka Trump and her husband Senior Advisor to the President of the United States Jared Kushner view displays of US items of the Royal Collection with Britain's Prince Andrew, Duke of York at Buckingham Palace AFP/Getty Images 32/86 Prince Harry, Duke of Sussex looks on as US President Donald Trump views US items of the Royal Collection at Buckingham palace AFP/Getty Images 33/86 U.S. President Donald Trump with The Queen and US First Lady Melania Trump during the welcome ceremony at Buckingham Palace Jeremy Selwyn 34/86 The car carrying U.S President Donald Trump leaves Buckingham Palace AP 35/86 People outside Buckingham Palace during U.S. President Donald Trump's state visit to Britain REUTERS 36/86 US President Donald Trump and US First Lady Melania Trump travel along the mall in their motorcade after leaving Buckingham Palace AFP/Getty Images 37/86 Royal guards march down Birdcage Walk on route to Westminster Abbey PA 38/86 British armed police officers patrol streets at Westminster Abbey EPA 39/86 US First Lady Melania Trump smileS with The Queen and Camilla, Duchess of Cornwall Jeremy Selwyn 40/86 U.S. President Donald Trump meets The Queen at Buckingham Palace Jeremy Selwyn 41/86 US President Donald Trump and his wife Melania are welcomed by Queen Elizabeth II, The Prince of Wales and The Duchess of Cornwall during the welcome ceremony at Buckingham Palace PA 42/86 U.S. President Donald Trump meets Prince Charles Jeremy Selwyn 43/86 The Queen Elizabeth, President Donald Trump, first lady Melania Trump, Britain's Prince Charles and Camilla, Duchess of Cornwall, listen to the US national anthem during a ceremonial welcome in the garden of Buckingham Palace AP 44/86 US President Donald Trump flanked by Britain's Prince Charles, Prince of Wales inspects an honour guard during a welcome ceremony at Buckingham Palace AFP/Getty Images 45/86 Members of the King's Troop Royal Horse Artillery fire a 82-gun double gun salute in Green Park AFP/Getty Images 46/86 U.S. President Donald Trump meets The Queen at Buckingham Palace Jeremy Selwyn 47/86 U.S. President Donald Trump meets Britain's Prince Charles as he arrives at Buckingham Palace Reuters 48/86 Camilla, Duchess of Cornwall greets First Lady Melania Trump Jeremy Selwyn 49/86 Camilla, Duchess of Cornwall and Prince Charles, Prince of Wales greet US President Donald Trump and US First Lady Melania Trump on their arrival for a welcome ceremony at Buckingham Palace AFP/Getty Images 50/86 The Queen Elizabeth waits to greet President Donald Trump and first lady Melania Trump as they walk up the steps with Britain's Prince Charles, right, and Camilla, Duchess of Cornwall AP 51/86 Marine One lands as U.S. President Donald Trump and First Lady Melania Trump arrive at Buckingham Palace, Reuters 52/86 Ivanka Trump looks out of the window at Buckingham Palace ahead of the visit of US President Donald Trump and First Lady Melania Trump Getty Images 53/86 Armed police lock down central London ahead of US President Donald J. Trump's visit to Westminster Abbey in London EPA 54/86 A supporter of the U.S. President Donald Trump argues with police officers outside Buckingham Palace during the state visit of U.S. President Donald Trump and First Lady Melania Trump to Britain Reuters 55/86 A protester outside Buckingham Palace PA 56/86 A changing of the guard takes place outside Buckingham Palace, London, during the first day of a state visit to the UK by US President Donald Trump PA 57/86 The Mall towards Buckingham Palace in the early morning which is decked with American Stars and Stripes and Union Jacks ahead of the State Visit of US President Donald Trump who arrives today for a 3 day state visit Rex Features 58/86 Police officers survey the area from the roof of Buckingham Palace AFP/Getty Images 59/86 A vehicle with a US number plate enters Buckingham Palace PA 60/86 A member of the public holds up a welcome sign outside Buckingham Palace, London PA 61/86 A U.S. helicopter lands at Buckingham Palace during U.S. President Donald Trump's state visit to Britain in London Reuters 62/86 @born_eco shares an image of a message for Trump which had been mowed into a lawn under the flight path of Air Force One @born_eco 63/86 Amnesty International install 'Resist Trump' banners on Vauxhall Bridge following the arrival of US President Donald Trump Getty Images 64/86 A Marine One helicopter lands near Winfield House during U.S. President Donald Trump's state visit to Britain Reuters 65/86 People wait in front of Buckingham Palace during the state visit of U.S. President Donald Trump and First Lady Melania Trump to Britain, Reuters 66/86 Police officers stand alongside their vehicles at Stansted airport in Essex ahead of the arrival there of US President Donald Trump and his wife Melania, aboard Air Force One, for the start of his three day state visit to the UK PA 67/86 U.S. President Donald Trump and First Lady Melania Trump arrive aboard Air Force One for their state visit to Britain, Reuters 68/86 Foreign Secretary Jeremy Hunt greets US President Donald Trump as he arrives at Stansted Airport Getty Images 69/86 President Donald Trump salutes an honor guard as he and first lady Melania Trump arrive at Stansted Airport AP 70/86 Air Force One lands carrying U.S. President Donald Trump and First Lady Melania Trump arriving for their state visit to Britain, at Stansted Airport AFP/Getty Images 71/86 US President Donald Trump (R) and US First Lady Melania Trump (L) disembark Air Force One at Stansted Airpor AFP/Getty Images 72/86 U.S. President Donald Trump boards Marine One as he arrives for his state visit to Britain, at Stansted Airport Reuters 73/86 A helicopter is seen over the skyline of London during the state visit of U.S. President Donald Trump and First Lady Melania Trump to Britain Reuters 74/86 Police and security personnel survey the area from the top of Winfield House, the residence of the US Ambassador in London AFP/Getty Images 75/86 Air Force One lands carrying U.S. President Donald Trump and First Lady Melania Trump arriving for their state visit to Britain, at Stansted Airport Reuters 76/86 Air Force One lands carrying U.S. President Donald Trump and First Lady Melania Trump arriving for their state visit to Britain, at Stansted Airport Reuters 77/86 Police officers patrol The Mall Rex Features 78/86 Guards wait before U.S. President Donald Trump and First Lady Melania Trump arrive for their state visit to Britain Reuters 79/86 Air Force One lands at Stansted airport in Essex Sky News 80/86 Air Force One lands carrying U.S. President Donald Trump and First Lady Melania Trump Reuters 81/86 Police officers stand alongside their vehicles at Stansted airport in Essex PA 82/86 Air Force Two arrives at Stansted Airport in Essex, for the start of a three day state visit to the UK by the US President Donald Trump and first lady Melania PA 83/86 Air Force One lands carrying U.S. President Donald Trump and First Lady Melania Trump arriving for their state visit to Britain, at Stansted Airport Reuters 84/86 Donald Trump called Sadiq Khan a "shorter" twin of Bill de Blasio. AFP/Getty Images 85/86 US President Donald Trump and First Lady Melania Trump stepped off Marine One and make their way to board Air Force One as they flew off to the UK AFP/Getty Images 86/86 President Donald Trump and First Lady Melania Trump EPA

Scotland Yard said it had “a very experienced command team” leading the operation as the force geared up to deal with the visit itself and expected protests.

A spokesman said: “This is a multi-faceted security operation, and whilst the Met has a responsibility to ensure the right to peaceful protest, this needs to be balanced with the complex requirements of this policing plan.”

Security has also been tightened for the UK’s national commemorations of the 75th D-Day anniversary, which will be attended by international figures including the Queen and Mr Trump.

This morning a protester who gave his name as Rudy, 39, said he had flown over from his home in Germnay to “pop my middle finger” at the president.

He said: “I’m actually old enough to remember when being against fascists was considered a good thing.”

One US tourist, Lauren Hammond, 32, from Nashville, who was visiting Buckingham Palace as part of a trip around Europe with her family, said: “We’re supporters of our president, we’re glad to see him here with the Queen. I think he’s very honest, brutally honest.”