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London Underground drivers are set to strike across four days next month including during Donald Trump's visit to the UK.

The RMT union on Tuesday announced a walkout in a row with Transport for London over working conditions and staffing.

Piccadilly Line drivers will strike between 9pm on Wednesday, July 11 and 1am on Saturday July 14 2018.

The US President is set to arrive in London on July 13 when huge protests are planned in the capital.

The disruption caused by the walkout will clash with tens of thousands of people descending on central London for the protest, which was arranged in response to Mr Trump’s visit.

The busy Tube line runs through central London - including several stations near the route of the anti-Trump march - and serves Heathrow Airport. It carries half a million passengers a day.

The RMT said the strike was in protest of the “appalling working conditions".

Faces of frustration: Battling the Tube strike 17 show all Faces of frustration: Battling the Tube strike 1/17 A tired commuter sits on a bus at Liverpool Street Jeremy Selwyn 2/17 A man looks through window on a bus at Victoria Station Carl Court/Getty Images 3/17 The top deck of a bus full on unimpressed commuters Stefan Rousseau/PA 4/17 Commuters queue patiently at Victoria bus station Justin Tallis/AFP/Getty Images 5/17 A man yawns on his way to work, as extra buses are laid on to help with capacity during a 24-hour tube strike Justin Tallis/AFP/Getty Images 6/17 Unhappy commuters on a bus at Victoria Station Alex Lentati 7/17 A man looks out on a window on a bus whilst battling the 24 hour tube strike Stefan Rousseau/PA 8/17 Commuters in Stratford, London wait for buses Stefan Rousseau/PA 9/17 A bus loaded with passengers bear the brunt on London Underground industrial action PAJohn Stillwell/PA 10/17 Disgruntled commuters walk across London Bridge making their way to work on foot Leon Neal/Getty Images 11/17 Commuters are seen through the windows of extra buses AFP/Getty Images 12/17 Bus queues at Liverpool Street Jeremy Selwyn 13/17 A woman wait for a bus at Liverpool Street Jeremy Selwyn 14/17 Commuters are seen through the windows of extra buses Justin Tallis/AFP/Getty Images 15/17 A woman make a call on her phone during the tube strike Jeremy Selwyn 16/17 Commuters queue for busses at Victoria Station Carl Court/Getty Images 17/17 People queue for buses at London's Waterloo Station Dominic Lipinski/PA 1/17 A tired commuter sits on a bus at Liverpool Street Jeremy Selwyn 2/17 A man looks through window on a bus at Victoria Station Carl Court/Getty Images 3/17 The top deck of a bus full on unimpressed commuters Stefan Rousseau/PA 4/17 Commuters queue patiently at Victoria bus station Justin Tallis/AFP/Getty Images 5/17 A man yawns on his way to work, as extra buses are laid on to help with capacity during a 24-hour tube strike Justin Tallis/AFP/Getty Images 6/17 Unhappy commuters on a bus at Victoria Station Alex Lentati 7/17 A man looks out on a window on a bus whilst battling the 24 hour tube strike Stefan Rousseau/PA 8/17 Commuters in Stratford, London wait for buses Stefan Rousseau/PA 9/17 A bus loaded with passengers bear the brunt on London Underground industrial action PAJohn Stillwell/PA 10/17 Disgruntled commuters walk across London Bridge making their way to work on foot Leon Neal/Getty Images 11/17 Commuters are seen through the windows of extra buses AFP/Getty Images 12/17 Bus queues at Liverpool Street Jeremy Selwyn 13/17 A woman wait for a bus at Liverpool Street Jeremy Selwyn 14/17 Commuters are seen through the windows of extra buses Justin Tallis/AFP/Getty Images 15/17 A woman make a call on her phone during the tube strike Jeremy Selwyn 16/17 Commuters queue for busses at Victoria Station Carl Court/Getty Images 17/17 People queue for buses at London's Waterloo Station Dominic Lipinski/PA

A statement released by the union said members "will be striking over a series of attacks on working conditions and staffing levels that have turned the line into a pressure cooker". ​

General Secretary Mick Cash said: “There have been repeated problems on the Piccadilly Line going back a number of years which have led to dispute after dispute and the failure of LU management to get a grip has tipped the situation over the edge yet again.

"That is why we have had no option but to put on these strike dates.

"Every effort by RMT reps to negotiate a settlement has been obstructed by the company and it is now down to LU bosses to start listening to their members, take the raft of issues at the heart of this dispute seriously and start engaging in a way that will allow us to make some genuine progress."

More than 50,000 people are expected to travel to central London on July 13 to attend the protest, which will begin in Portland Place and end up in Downing Street.