When asked whether he'd like to see the United Kingdom pull further from the United Kingdom and opt for a "hard Brexit", Trump told reporters "It's not for me to say", and stuck to this line when pushed harder for comment.
The two displayed warm chemistry at the dinner, USA and European officials said, with Trump praising May, and the publication of the interview had the potential to disrupt the carefully choreographed visit.
In an interview with The Sun, Trump said May had ignored his advice on Britain's departure from the European Union. "I think she represents her country so well", Trump told The Sun newspaper of the UK.
On Brexit, he said: 'I would have done it much differently. "I think he's got what it takes".
The protests had been expected and promised - and after Trump arrived in England on Thursday, he fanned the fire anew, giving an interview with a tabloid in which he gave scathing critiques of Prime Minister Theresa May, his host for the visit between allies.
May likewise glossed over the comments in the Sun.
- Kyle Griffin (@kylegriffin1) July 13, 2018 The president added that he has experienced "an incredible two days" in the country, and stressed that he is working with May's government on anti-terror policy and broader U.S.
"The United States' commitment to North Atlantic Treaty Organisation remains very strong", Trump told reporters at a surprise news conference following the emergency session of North Atlantic Treaty Organisation members.
Trump also refrained from openly endorsing U.K. Prime Minister Theresa May's leadership but praised the former foreign secretary Boris Johnson, who resigned Monday in protest at the Brexit deal May presented to the cabinet over the weekend for being "weak".
Neither Trump nor North Atlantic Treaty Organisation offered specifics on what Trump said he had achieved.
The police will be out in full force to cover Mr Trump's short visit in the UK.
"I think it's fine", he said.
Trump will spend very little time in London, having stayed in the capital for a single, well-insulated night at the official residence of the U.S. ambassador in Regent's Park.
In an interview with The Sun, Trump said May's long-awaited blueprint for Brexit, published this week, would "probably kill" any future trade deal between the U.S. and U.K. He also said May's arch-rival Boris Johnson-who resigned as foreign secretary on Monday in protest at the blueprint-would "make a great prime minister".
Trump, in an interview with Britain's Sun newspaper, criticized London Mayor Sadiq Khan, saying he had not been "hospitable" to the USA government.
He added: "You have a mayor who has done a bad job in London". Protest organizers said on their campaign website they want to "make sure [Trump] knows that all of Britain is looking down on him and laughing at him" during his visit.
Sterling sank nearly 1% after US President Donald Trump said Theresa May's Brexit plan probably killed off hope of a US-UK trade deal.
"The President likes and respects Prime Minister May very much".
The newspaper quoted a United States official who said there was "no way Trump will apologise" for what he said in the interview but added "we also don't want to blow everything up".