"Our message to our government and our prime minister is: "We don't want a special relationship with bigots", Len McCluskey, the head of the country's biggest trade union, told Reuters.
If Johnson and Trump are kindred spirits politically, Khan this week authorised a plan by protestors to float a six-metre (19-foot) inflatable of a distinctly orange nappy-clad baby bearing Trump's face above London's Parliament Square on Friday.
"Take a look at the terrorism that is taking place", Trump said.
The Queen greeted Mr Trump and the first lady as their motorcade arrived at Windsor Castle.
With its straw-blond hair, questionable face tan and unmistakably out-of-proportion hands, a blimp meant to depict President Donald Trump as a screaming baby flew outside the Parliament building in London Friday.
He spent much of Friday attempting to undo the damage done by an explosive interview with The Sun, in which he indicated he would not do a trade deal with Britain if he considered a soft Brexit to have been passed.
In the piece, Trump gave May advice on how to handle the exit from the European Union and said he "would have done it much differently".
A third person said: "Did you guys just accidentally try to break up the United Kingdom?"
During his visit, Mr. Trump managed to avoid thousands of protesters in London, Scotland and around the country. Mr. Trump's intervention was "very important, because if you can't do a trade deal with your closest ally, then who can you do a trade deal with?" said Jacob Rees-Mogg, a Tory MP who has been among the sharpest critics of Ms.
"Just make sure we can trade together, that's all that matters", he said.
She maintained the government's Brexit agreement, which has come under fire from supporters of a "hard Brext" "delivers" on the referendum vote.
Earlier, Mr Trump said he and Mrs May had spoken for an hour-and-a-half at the black-tie dinner at Blenheim Palace, which he attended with his wife Melania. "Of course that's coming from NBC, which is possibly worse than CNN", he said, adding that her question was "dishonest reporting".
Pres. Trump denies interview with The Sun was critical of Prime Minister Theresa May.
Melania Trump visited veterans on Friday at London's Royal Hospital Chelsea where she also met local school children, accompanied by May's husband Philip.
Watch Trump's response about May below, and listen to the "fake news" audio here.
In his Sun interview, Mr Trump also said former Foreign Secretary Boris Johnson - who disagrees with the PM on Brexit and resigned this week - would make a "great prime minister", adding: "I think he's got what it takes".
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