On Friday, he will join May for a counter-terrorism demonstration by United Kingdom and USA special forces, before the main business element of his trip: talks with May and the new foreign secretary, Jeremy Hunt, at the PM's Chequers country retreat, including a working lunch.
Trump had no qualms about blasting May's plan for how the UK should leave the European Union, and he even took it a step further by appearing to threaten US-UK trade deals based on her Brexit approach. The president also said North Atlantic Treaty Organisation had "never been more united", a day after he roiled the military alliance's annual summit in Belgium by insulting allies' defense spending. He paid a brief visit to the USA ambassador's central London residence before taking a helicopter to Blenheim Palace ― the monumental house where Winston Churchill was born― for a lavish dinner event with British Prime Minister Theresa May.
Trump also heaped praise on Johnson, May's nemesis who resigned over the "soft Brexit" blueprint on Monday, suggesting he would "make a great Prime Minister".
Trump held nothing back during the interview with Britain's The Sun, saying a new trade deal with the United States was unlikely because of May's Brexit negotiation tactics.
Concerning Brexit, Trump said, "I would have done it much differently".
Trump's interview with the British tabloid "The Sun" - in which he knocked May's "soft Brexit" compromise and boosted a rival within her own party - published Thursday and dealt a stunning diplomatic affront for a visiting USA president.
Trump acknowledged that he knew about the plan to float a blimp caricature, telling The Sun, "I guess when they put out blimps to make me feel unwelcome, no reason for me to go to London".
Another elaborate protest saw a "Dalek Trump" - a version of the robotic bad guys from Doctor Who, customized with a red tie and blond wig - patrolling Whitehall in Central London amid a phalanx of mock security agents.
From there he will be helicoptered to Windsor Castle to meet the Queen.
Mr Trump's mother, the late Mary MacLeod Trump, was Scottish.
U.S. President Donald Trump said on Friday he looked forward to finalizing a post-Brexit trade deal with Britain, striking a contrasting tone to a newspaper interview when he said Prime Minister Theresa May's strategy would kill such an agreement.
Twitter Bigwigs Who Suffered Massive Loss of Followers After Cleanup
President Uhuru Kenyatta retired to bed on Thursday night with more followers on Twitter than he woke up to on Friday. Barack Obama's (@barackobama ) total followers shrank by 2.1 million, or 2.1%, to 101.5 million.
"I actually told Theresa May how to do (Brexit)", the US leader said in the interview, "but she didn't agree, she didn't listen to me".
"I don't think it will kill the deal".
In an interview with The Sun, Trump said May had ignored his advice on Britain's departure from the European Union.
DESPITE leaving hungry guests waiting while he toured the Churchill exhibition and thousands protesting outside the gates, county council leader Ian Hudspeth has described Donald Trump's visit to Blenheim Palace last night as a success.
London Mayor Sadiq Khan rejected suggestions the blimp showed a lack of respect to the US president.
Sarah Elliott, chairwoman of Republicans Overseas UK, said that as president, Trump should be offered respect wherever he goes.
"But when they make you feel unwelcome, why would I stay there?"
"The idea that we would curtail freedom to protest, freedom of speech, because someone's feelings are hurt is laughable", Khan said Friday in an interview with CNN's Christiane Amanpour. Some signs read "Dump Trump", "Lock Him Up" and "There Will Be Hell Toupee".
"Women's March London is holding a joyful day of noise and action which will serve as a timely reminder of the collective challenges the world is facing and the importance of joining together in solidarity to overcome these challenges".