"The prime minister has a good relationship with the president". Even if his criticism of May were part of a negotiation strategy to achieve a better trade deal with the United Kingdom, as Brennan pointed out, that's not even on the table yet.
After Trump's interview 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".
But even if Britain can extricate itself from the dense web of regulations and tariffs resulting from its decades of European Union membership, a US-UK trade deal would be easier said than done.
Staff at Britain's Blenheim Castle were likely still cleaning up after a lavish state dinner Thursday when The Sun dropped the contents of its wide-ranging interview with U.S. President Donald Trump.
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Mr Duncan suggested the President had not seen the details of the plan when he gave the interview on Wednesday, while also stressing that the much-vaunted special relationship was about much more than Brexit.
"I said, 'I want to apologise because I said such good things about you, ' And she said, 'Don't worry, it's only the press, '" Trump said of their purported conversation.
Trump has claimed to have recorded disputed exchanges in the past without providing evidence.
"Now it's not the United States, many presidents have come here and said this is not fair and then they go home and go to sleep".
"I just think it is changing the culture, I think it is a very negative thing for Europe", he added.
The president slammed Sadiq Khan, the mayor of London, a city that has been the target of several terrorist attacks in recent years: "I look at cities in Europe, and I can be specific if you'd like".
"The UK has a proud history of welcoming people who are fleeing persecution to our country", she said. "But it is too bad what is going on". He asked one of the reporters who was at the press conference to confirm he said "nice things" about May and that he wished they had put those in the headline of the story.
Trump told the Sun newspaper he was avoiding the capital as much as possible.
In contrast to the president's sharp words, Trump was hosted at a number of opulent events, including an audience with Queen Elizabeth II at Windsor Castle later Friday. "I think [Khan] has not been hospitable to a government that is very important".
May had ignored his own advice on how best to confront Brussels, he said, while praising her departed foreign secretary. The queen navigated her way around him.
Among them was Emily Bryce, who proudly carried a homemade banner written in Gaelic, in recognition of Trump's Highland roots.
"The UK can't afford to alienate either the United States or the European Union, its two largest foreign trade partners, and will not be able to choose an "either-or" solution", commented Fiona Cincotta, senior market analyst at City Index in London.
The president also pledged to raise the issue of election meddling during the summit and said he would tell Putin not to interfere in future US elections.
Trump said he plans to raise a range of topics in his summit Monday with Russian President Vladimir Putin in Helsinki, including nuclear proliferation, which Trump said he considers the largest problem facing the world. I think the immigration, allowing the immigration to take place in Europe is a shame. That's your decision. Whatever you're going to do is OK with us.
The lack of divergence on rules in the farming sector is one of the main concerns of Tory MPs opposed to May's plan, and they will see Trump's statement as proof that the Brexit plan will indeed thwart a trade deal.