In an interview published just hours before he was due to have lunch with May and tea with Queen Elizabeth on Friday, Trump chided the "very unfortunate" results of the prime minister's Brexit negotiation.
She said: "Trade is one of the top items for discussions between the president and the PM today and we are confident that we can do a good trade deal with the US". Just a week after his inauguration, Prime Minister Theresa May invited the president for a state visit, the type of event that normally includes glittering horse-drawn carriages and a state dinner hosted by the monarch.
'Policies that are having very real impacts on real lives not just in the U.S. but all over the world'.
"Boris Johnson's a friend of mine, he's been very nice to me, very supportive and maybe I'll speak to him when I get over there".
Trump angered European allies at a North Atlantic Treaty Organisation summit this week and then accused British Prime Minister Theresa May of being too soft with the EU on Brexit negotiations.
She listed Mr Trump's immigration policies, bans on some people entering the U.S., his foreign policies, and lack of support for taking action on climate change as having affects across the globe.
Leo Murray, an environmental campaigner, leading the protest, told the Guardian, "People in Scotland are past masters when it comes to protesting against Trump".
Mr Trump had accused Sadiq Khan of doing a "very bad job" of tackling terrorism and crime in the capital. Mr. Trump has been a keen supporter of Brexit and on Thursday he appeared to echo those concerns.
"Clearly, the really hard Brexiters, the people who regard Theresa May as being a traitor, for keeping any sort of deal going with the European Union, they're going to love this", Lee said. It has never been more united, people are paying.
On Saturday, Trump supporters will rally near the United States embassy in Nine Elms, south London, for an event titled "Welcoming Trump to Britain Rally - Make Britain Great Again", at which a number of right-wing figures are scheduled to speak.
May's "business-friendly" Brexit plan - which would keep Britain in a free trade zone for goods with the European Union but mean it has to share some European Union rules - was agreed by her cabinet only last Friday after two years of wrangling since Britons voted to leave the bloc in a 2016 referendum.
-British trade deal and that she had failed to take his advice on how to negotiate with the European Union.
A mass demonstration called "Together Against Trump" by left-wing campaign groups is organised for Friday, with a giant balloon of Trump depicted as a crying baby in a nappy set to fly next to the British parliament.
Trump is on a "working visit" rather than a full state occasion.
He paid a brief visit to the US ambassador's central London residence before taking a helicopter to Blenheim Palace ― the monumental house where Winston Churchill was born― for a lavish dinner event with British Prime Minister Theresa May.
And in an apparent plea to the president to remember his allies when he meets Vladimir Putin on Monday, Mrs May noted that Britain and America work closely on security "whether through targeting Daesh terrorists or standing up to Russian aggression".
As well as in London, protests are expected to take place in Bristol, Newcastle, Leeds, Cambridge and Cardiff after Trump arrives here on Thursday.
He will spend the weekend with wife Melania in Scotland, where he owns two luxury golf courses.