Trump chastised May for ignoring his advice on Brexit and not making a credible threat to walk away from talks.
Trump also used the interview to launch an attack on Theresa May's plans for Brexit which were unveiled in full yesterday and indicate a willingness on the UK's part to keep customs borders open with the EU.
"I welcome President Trump's forthcoming meeting with President Putin: Open channels of communication between the United States and Russian Federation are key to managing the risks of confrontation", May said in a speech during a working dinner with North Atlantic Treaty Organisation allies, according to quotes from her remarks provided by her office. The Prime Minister will host a dinner at Winston Churchill's birthplace Blenheim Palace, with some of businesses biggest names - thought to include Sir Jim Ratcliffe, founder of Ineos, Larry Fink, head of BlackRock, and Alex Gorsky, chief executive of Johnson & Johnson. I am just saying I think he would be a great Prime Minister.
By Friday afternoon, Mr. Trump appeared to backtrack, saying he'd had an opportunity to learn more about Ms. Her office had no immediate reaction to his remarks, beyond referring back to her speech. Interviewed before he left Brussels for the UK, Trump had accused May of ruining what her country stands to gain from its Brexit vote. Great British humour coupled with real anger.
"And it creates conditions, as it would Britain a member of the internal market for goods without any problems in that and that means, again, that we have always said all freedoms together and especially also that you have to pay money for the internal market as, for example, Norway and Sweden".
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.
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It's always been an open secret that numerous Twitter users rely on bogus accounts and bots to inflate their follower count. The most popular accounts have more than 100 million followers, and Donald Trump is far down the list with 53.1 million.
The proposal includes plans to create a "common rule book" - involving a free trade area with the European Union on industrial and agricultural goods.
At the same location a week ago, May finally won agreement for her Brexit plans from her cabinet after two years of tortuous internal wrangling.
Outside the mansion, near Oxford to the northwest of London, a couple of thousand demonstrators lined the road and booed Trump's arrival.
Protesters are set to fly the Baby Trump blimp over Parliament on Friday when Trump will not be in town.
"I think he has not been hospitable to a government that is very important". "A friend who bullies us is no longer a friend".
Mr Trump is due to meet Vladimir Putin, who has rejected the nerve agent claims, at a summit when he finishes his four-day visit to Britain. Instead, the White House only pointed to the positive things Trump said about May, with no mention of the tape.