"I think our Prime Minister should have the confidence to speak to the US President on equal terms and it's for President Trump to say what he wants about me", Khan told iTV. "She's a total professional, because when I saw her this morning I said, 'I want to apologize, because I said such good things about you"'.
Standing next to the Prime Minister at a press conference at Chequers, the President shifted his stance from that in The Sun's world exclusive interview where he warned a softer Brexit would "probably kill" a USA trade deal.
"I guess when they put out blimps to make me feel unwelcome, no reason for me to go to London", the president said.
The newspaper interview dropped on the same night May honored him at a black-tie dinner at Winston Churchill's ancestral home.
While his schedule studiously avoids any high-profile events in London, the British capital will see a mass demonstration and rally Friday, one of several protests across Britain including a tuneful one by a group of opera singers.
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".
Trump also denied a Washington Post report that he called May a "bossy schoolteacher".
Queen Elizabeth later welcomed the president and First Lady Melania Trump Friday for a formal tea at Windsor Castle. "He obviously likes me, and says very good things about me", Trump said.
The agenda for Trump and May on Friday includes discussion on relations with Russian Federation, ahead of a summit in Finland on Monday between Trump and President Vladimir Putin.
Trump also lashed out at United States broadcasters CNN and refused to take a question from them.
In another blow to May, Trump said her now ex-foreign secretary "would be a great prime minister". "I'm not going to rise to President Trump's views".
"The sense of betrayal in this country will be huge, and I very much hope that she's out of office before too long", Farage said. "He thought she was great on North Atlantic Treaty Organisation today and is a really terrific person".
Thursday, Trump had said, "I think they like me a lot in the U.K". "I think they agree with me on immigration", he told reporters in Brussels.
The highly-controversial remarks piles further pressure on the embattled PM as she desperately tries to unite her divided Tory party over Brexit.
The president arrived in the United Kingdom on Thursday but is largely circumventing the capital and the massive protests against him.
"Take a look at the terrorism that is taking place", Trump said. "I think he has done a very bad job on terrorism", he said. Scottish police, however, said that the balloon could not fly over the Turnberry golf club Trump owns on the west coast of the country.
Calling her a "tremendous woman", Trump said "she has really never made a mistake".