"At the same time, we will not compromise our fundamental values of equality, diversity and human rights, and we expect these values to be made clear during the presidential visit to the UK".
"We'll see where it leads", Trump said.
Perhaps in a reference to Mr Trump's meeting with Vladimir Putin on Monday, she said that Britain and the USA work closely together in the interests of their shared security, "whether through targeting Daesh [Islamic State group] terrorists or standing up to Russian aggression".
"I would love to say that I think this is going to be a hugely successful visit but I think it's going to be very hard", he said at a pro-Trump gathering in parliament.More news: Travis Pastrana To Attempt Three Daring Evel Knievel Jumps
"I would say Brexit is Brexit", Trump said at North Atlantic Treaty Organisation press conference.
At the same time, Trump will be touring a defense site with May outside of London.
A YouGov poll on Wednesday showed 77 percent had an unfavourable opinion of the president and just 50 per cent thought his visit should go ahead.
A Downing Street spokesperson told HuffPost UK: "On Friday she is going to have a separate program in London, and because it's in London I'm not able to share the location but she plans to meet veterans and local schoolchildren".More news: Trump lawyer holds off on Mueller interview OK
While in Great Britain, Mr Trump will be running to a tight schedule which involves a high class dinner at Blenheim Palace, surveying United Kingdom military forces and visiting Chequers, the Prime Minister's official retreat in Aylesbury. "But I believe the people in the UK, Scotland, Ireland - as you know I have property in Ireland, I have property all over - I think that those people, they like me a lot and they agree with me on immigration".
The two "Beasts" are among and huge motorcade of vehicles flown into Britain on two United States Air Force Boeing C-17 transport planes ahead of Trump's visit. These will focus on relations with Russian Federation, trade, Brexit and the Middle East.
Trump's trip coincides with a tumultuous week for May after two senior ministers resigned in protest at her plans for trade with the European Union after Britain leaves next March.
Top it off with the introduction of trade policies that have targeted some European industries - even though European nations are longtime friends accustomed to easy trade with the USA - and it is not surprising that Trump's itinerary will keep him out of central London on Friday, when large protests are planned. It was during that trip to Washington that she invited him to the UK.
"Now, for the benefit of all our people, let us work together to build a more prosperous future".More news: How significant is Trump's Supreme Court pick?
The two leaders will hold talks the following day at Chequers, the 16th-century manor house which is the prime minister's official country residence.
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