Responding to the Prime Minister's proposals for the future relationship with the EU, which saw Mr Johnson and David Davis resign from her Cabinet, the president had told the newspaper: "If they do a deal like that, we would be dealing with the European Union instead of dealing with the United Kingdom, so it will probably kill the deal".
Trump also said that he was "very saddened" to see Johnson was leaving government and said he hoped "he goes back in at some point".
"I love the United States but I love getting along with Russian Federation and China and other countries".
While he added that he thought Johnson would one day be a good candidate to lead the country, he insisted that he wasn't trying to put Johnson against May.
Khan made the remarks after Trump doubled down on his claims that the mayor had failed to do enough to protect London from Islamist terrorist attacks. "I think it's very negative".
The visit is also being marked with protests in central London, as well as outside the USA ambassador's residence where the Trumps are staying, while others lined the streets in Blenheim holding placards. I think she's a terrific woman, and I think she's doing a terrific job.
May's Strategy Will ‘Kill’ Trade Deal With US
Johnson, with limited success. "I didn't criticize the prime minister", he said. "He's been very nice to me". And maybe, some day, she'll do that. "You can't walk away because if she walks away that means she's stuck".
Yet, now that protesters are planning to fly a great big diapered Baby Trump blimp, he doesn't feel welcome anymore. "At least 7 dead and 48 wounded in terror attack and Mayor of London says there is 'no reason to be alarmed!'" Trump tweeted.
During a press conference Friday afternoon, he denied criticizing May and suggested that the newspaper had left out his praise of the British prime minister.
Trump also said Europe is "losing its culture" because of immigration from the Middle East and Africa. "The real reason Trump blames my friend @SadiqKhan for the terror attacks a year ago is simple", he tweeted.
Mr Trump and his wife Melania arrived at Stansted airport, where he was met by the UK's global trade secretary Liam Fox. "They want the same thing I want". He then reminded the press that his mother was from Scotland. Brits gathered outside the U.S. ambassador's residence in London, where the Trumps are staying, according to reports.
Trump may be referring to his past feud with London Mayor Sadiq Khan, who has been outspoken about his disapproval of Trump's visit.
However, his trip is set to be overshadowed by news that a US federal grand jury has indicted 12 military intelligence officers on charges of hacking the computer networks of 2016 Democratic presidential candidate Hillary Clinton and the Democratic Party.
Asked about the former foreign secretary at Chequers yesterday, Mr Trump said: "He's been very nice to me. As he said in his interview with The Sun she "is a very good person" and he 'never said anything bad about her, '" the White House responded.