Mrs May said the USA was "keen" to do a deal with the United Kingdom, adding: "We will do a trade deal with them and with others around the rest of the world".
At the time, Khan criticised Trump as "ill-informed" and on Friday, lauded the "special relationship" between Britain and the United States. "This is an incredible opportunity for our two countries and we will seize it fully".
And as May struggles to hold her own government together, with the never-ending arguments about Brexit negotiations threatening to tear her Conservative party apart.
Some lawmakers in her deeply divided Conservative Party have cast May's "business-friendly" Brexit plan as a betrayal that would leave Britain too close to the European Union and warned that she might face a leadership challenge. "I would have done it much differently".More news: World’s ugliest dog dies weeks after winning title
He added: "I actually told Theresa May how to do it but she didn't agree, she didn't listen to me".
However, he later said Ms May was doing a "fantastic job". "Of course that's coming from NBC, which is possibly worse than CNN", he said, adding that her question was "dishonest reporting".
But he said that the investment had done "wonders for the area" and that his Scottish grandmother would be "smiling down" from heaven in pride at the work in her native land.
May, likewise, glossed over the comments in the Sun, saying her deal provided a platform for an ambitious free trade deal.
Mr Trump's visit came as watchdog Scottish Natural Heritage found the Trump International Links has "partially destroyed" the specially protected site it was built on. May during which he also described U.S. -Britain relations as "the highest level of special".More news: 70 killed in attack at election rally in Pakistan's Quetta
Donald Trump has tried to backtrack on his criticism of Theresa May's Brexit plans - but has instead confirmed the fears of many Tory MPs over the policy. It was one of the more than 100 demonstrations planned across the country during his four-day stay.
"I think he's got what it takes".
Trump said May's so-called soft-Brexit approach went "the opposite way" to what he had recommended and that it was "very unfortunate".
After Trump's interview was published, White House spokeswoman Sarah Sanders said the president "likes and respects Prime Minister May very much", adding that he had "never said anything bad about her".
Trump and May watched a display of military special forces on Friday before their formal talks which were due to include Russian Federation, ahead of a summit in Finland on Monday between Trump and President Vladimir Putin.More news: Best tweets: 'Savage, classless Chelsea didn't even thank Antonio Conte'
He said: "I read reports where that won't be possible, but I believe after speaking with the prime minister's people and representatives and trade experts it will absolutely be possible". "I used to love London as a city".