But the reality TV star-turned-Republican politician is immensely unpopular in the United Kingdom, with major protests planned for his visit.
On the protests outside, with around 3,000 people demonstrating including Oxford West MP Layla Moran as well as a slew of largely Liberal Democrat and Labour councillors, he said: "I think whatever your views on the President he has been democratically elected, so we should respect that".
The president's remarks came out shortly after Mrs May's government outlined Brexit plans to retain close ties to the European Union.
"You have a mayor who has done a awful job in London", he said in an interview with Friday's edition of The Sun newspaper.
"I would have done it much differently", Trump added of May's Brexit approach. I think she is a nice person.
Donald Trump, 72, is about to visit the United Kingdom for the first time since being elected president in November 2016, and the British people aren't prepared to give him a warm welcome.
May likewise glossed over the comments in the Sun.
He said that May's new, softer approach to Brexit - which would leave Britain sticking to a "common rulebook" with Brussels on goods - would kill off the chances of a much sought-after U.S. -U.K. trade deal. "The Chequers agreement reached last week provides the platform for Donald and me to pursue an ambitious deal that works for both countries right across our economies".
An activist group was given permission to fly the blimp over London during Trump's visit, which will reportedly be met with up to 200,000 protestors in the streets.
Some British politicians expressed outrage over Trump's interview, particularly his criticism of British Prime Minister Theresa May's Brexit negotiation strategy and claim that she "didn't listen" to his advice on the issue.
"She should negotiate the best way she knows how".
Speaking on ITV's Good Morning Britain today, Ms Thornberry said it is "extraordinarily rude of Donald Trump to behave like this".
According to the Guardian, shortly after Trump landed Thursday, the Amnesty UK unfurled "Donald Trump: Human Rights Nightmare" on Vauxhall Bridge, opposite the U.S. Embassy.
Blenheim Palace is the birthplace of Winston Churchill, for whom Trump has expressed admiration. Just as the USA president's remarks that her plan would "kill" any trade deal with the USA began to reverberate around social media on Thursday evening, the former Ukip leader used an appearance on Andrew Neil's This Week to claim he had fed the idea to Trump. Mayor Sadiq Khan has "done a very bad job on terrorism", Trump declared, linking immigration to a deadly wave of knife crime in London, as he began a contentious four-day trip to Britain this week. "They like me a lot in the UK".
The President went on to say former Foreign Secretary Boris Johnson, who resigned over May's plan on Sunday, would "make a great Prime Minister". "I think it changed the fabric of Europe and, unless you act very quickly, it's never going to be what it was and I don't mean that in a positive way".
Mr Khan continued to refuse to rise to Trump's taunts after the US President attacked him again on his visit to the UK.
White House spokeswoman Sarah Sanders later told reporters Trump was "thankful for the wonderful welcome" he received in Britain.
The newspaper quoted a USA official who said there was "no way Trump will apologise" for what he said in the interview but added "we also don't want to blow everything up".
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Saturday Night Live's Michael Che and Colin Jost will co-host 70th Emmy Awards, airing live on Monday, Sept. 17, at 8 p.m. She added a postscript: "I think my mother at this moment may actually be satisfied".