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Donald Trump's defence of US gun policy and claim that a London hospital has blood-covered floors amid a spate of knife crime are "ridiculous", a leading trauma surgeon said today.

Speaking at a pro-gun rally, the president described the capital as having "unbelievably tough gun laws", but said it is "getting used to" stabbings.

Professor Karim Brohi, a trauma surgeon at the Royal London Hospital, said it was "ridiculous" to suggest guns could help combat knife violence in the city.

The US president has faced a furious backlash from Londoners after describing an unnamed “prestigious hospital” in central London as “like a war zone for horrible stabbing wounds”.

"Yes that's right, they don't have guns, they have knives. And instead there's blood all over the floors of this hospital. They say it's as bad as a military war zone hospital," he said.

Making a stabbing motion with his hand, Mr Trump then said: "Knives, knives, knives."

It is not clear which specific hospital Mr Trump was referring to, but another trauma surgeon at Royal London, Doctor Martin Griffiths, spoke out last month of the problems of both gun and knife crime, saying some of his military colleagues had likened working there to their time at Camp Bastion in Afghanistan.

He spoke to BBC Radio 4 about young victims of violence after a spate of deadly crime in the city, which meant the number of suspected murders in March was higher than that of New York.

In a statement following Mr Trump's comments, Professor Brohi said: "Knife violence is a serious issue for London. We are proud of the excellent trauma care we provide and of our violence reduction programmes.

"The Royal London Hospital has cut the number of our young patients returning after further knife attacks from 45 per cent to 1 per cent.

"There is more we can all do to combat this violence, but to suggest guns are part of the solution is ridiculous.

"Gunshot wounds are at least twice as lethal as knife injuries and more difficult to repair.

"We are proud of our world-leading service and to serve the people of London."

Dr Griffiths responded to Mr Trump on Twitter with an image suggesting the president had missed the point, adding that he was "happy to invite Mr Trump to my prestigious hospital".

Mr Trump's comments come ahead of a visit to the UK in July, although a trip to London has not been confirmed.

Mr Trump told the National Rifle Association (NRA) convention in Dallas, Texas: "I recently read a story that in London, which has unbelievably tough gun laws, a once very prestigious hospital right in the middle is like a war zone for horrible stabbing wounds.

"Yes that's right, they don't have guns, they have knives. And instead there's blood all over the floors of this hospital. They say it's as bad as a military war zone hospital."

Making a stabbing motion with his hand, Mr Trump then said: "Knives, knives, knives."

He added: "London hasn't been used to that, they're getting used to it. It's pretty tough."As of April 6, Scotland Yard had launched 55 investigations into suspected murders in 2018.

At least 35 of those killed were stabbed to death.

Liberal Democrat home affairs spokesman Sir Ed Davey said despite a rise in crime in the capital, Mr Trump's remarks are "nevertheless ridiculous".

He said: "To defend America's shocking gun laws by revealing his ignorance of Britain should alarm even his apologists in the Conservative Party."

He challenged Theresa May to confirm she would explain to Mr Trump during his trip here that "the UK's strict gun laws have been key to keeping gun crime much lower than in America, and that the recent rises in knife crime have not been caused by our gun laws".

The London Mayor's office declined to comment on Mr Trump's latest remarks.

Sadiq Khan has previously clashed with the US president over Mr Khan's response to terrorism.

Mr Trump also argued during his NRA speech that the Paris terror attack, which left 130 people dead, could have been prevented if more people were armed.

Mr Trump will make a working visit to the UK on July 13, but details of his trip have not yet been confirmed.

The US ambassador to Britain, Woody Johnson, said Mr Trump would "definitely" be coming to London, despite the warnings of likely demonstrations.