Donald Trump has said the UK will “probably not” get a trade deal with the US, if the prime minister’s Brexit plan goes ahead.
He told The Sun the PM’s plan would “probably kill the deal” as it would mean the US “would be dealing with the European Union” instead of with the UK.
Downing Street has not yet reacted to Mr Trump’s remarks.
Theresa May has been making the case for a US free trade deal with Mr Trump, on his first UK visit as president.
Mr Trump also said that former foreign secretary Boris Johnson would make a “great prime minister”, adding “I think he’s got what it takes”.
In his interview, he renewed his criticism of London Mayor Sadiq Khan over last year’s terror attacks in the capital, saying he had done “a terrible job”.
The president and his wife were given a red carpet reception at Blenheim Palace, Oxfordshire on Thursday evening.
After it was published, White House spokeswoman Sarah Sanders said the president “likes and respects Prime Minister May very much”, adding that he had “never said anything bad about her”.
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Image captionProtesters near Blenheim Palace making their feelings known
Mr Trump told The Sun newspaper that the UK’s blueprint for its post-Brexit relations with the EU was “a much different deal than the people voted on”.
He said the Brexit proposals Mrs May and her cabinet thrashed out at Chequers last week mean it would be “most likely … we would be dealing with the European Union instead of dealing with the UK, so it will probably kill the deal”.
He also said he had told Mrs May how to do a Brexit deal, but: “She didn’t agree, she didn’t listen to me.”
“I told her how to do it. That will be up to her to say. But I told her how to do it. She wanted to go a different route,” he said.
The BBC’s Political Editor, Laura Kuenssberg, said Mr Trump’s interview had “driven a bulldozer” through Mrs May’s claim that the UK would be able to get decent trade deals with the wider world, while sticking to the EU rules.
UK reaction to the president’s remarks has been mostly critical.
Conservative MP Sarah Wollaston called them “divisive, dog-whistle rhetoric”, and added: “If signing up to the Trump world view is the price of a deal, it’s not worth paying.”
Labour MP Phil Wilson, supporter of the People’s Vote campaign which calls for a public vote on the final Brexit deal, said Mr Trump’s comments showed the prime minister’s “botched” Brexit proposal was “worsening hour by hour”.
He said: “She has pinned all her hopes on getting a trade deal with Donald Trump but instead the US president has explicitly backed and strengthened those who advocate a disastrous no deal Brexit.”
Mr Trump’s comments came on the same day the UK government published its proposal for its long-term relationship with the EU.
The long-awaited plan is aimed at ensuring trade co-operation, with no hard border for Northern Ireland, and global trade deals for the UK.
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Image captionBlenheim Palace is the ancestral home of Sir Winston Churchill
But leading Brexiteers, Boris Johnson and David Davis, resigned from the cabinet days after ministers reached agreement on the plan at Chequers a week ago.
Responding to an earlier suggestion by President Trump that the British people were not getting the Brexit they voted for, Mrs May said: “We have come to an agreement on the proposal we are putting to the European Union which absolutely delivers on the Brexit we voted for.”
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Image captionMrs May greeted Donald Trump as he left his car
Analysis, by BBC political editor Laura Kuenssberg
President Trump drives a bulldozer through the government’s central claims about their compromise – that the UK would be able to get decent trade deals with the wider world, while sticking to the EU rules.
A lot of this visit has been carefully choreographed, as the prime minister and the president dance around each other.
But if the president really wanted to help her build support for her controversial compromise, this isn’t the way to do it.
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At Thursday’s dinner, Mrs May said that more than one million Americans work for UK-owned firms, telling Mr Trump: “As we prepare to leave the European Union, we have an unprecedented opportunity to do more.
“It’s an opportunity to reach a free trade agreement that creates jobs and growth here in the UK and right across the United States.”
Media captionSome of Mr Trump’s supporters and protesters have been explaining their motivation
As Mr Trump arrived in the UK, protesters gathered outside the US ambassador’s residence in in Regent’s Park, London, and an estimated 1,000 of them demonstrated near the palace, the birthplace of wartime Prime Minister Winston Churchill.
John Rees of the Stop the War group addressed protesters, saying of Trump: “He’s a wrecking ball for race relations, he’s a wrecking ball for prosperity, he’s a wrecking ball for women’s rights, he’s a wrecking ball for any peace and justice in this world and we have to stop him.”
Image copyrightEPA
Image captionMr Trump briefly held Mrs May’s hand as they went up the stairs
On Friday, Mrs May and Mr Trump will go to watch a joint counter-terrorism exercise by British and US special forces at a military base.
The pair will then travel to Chequers – the PM’s country residence in Buckinghamshire – for talks with the foreign secretary.
Extra security is in place to police the protests. More are planned for the second day of Mr Trump’s visit.
The president and first lady will travel to Windsor on Friday afternoon to meet the Queen, before flying to Scotland to spend the weekend at Mr Trump’s Turnberry golf resort. This part of the visit is being considered private.
