It is not a state visit, so the President will stay with the U.S. ambassador in London instead of being hosted by the Queen.
"Our trade and investment relationship is unrivalled - we are the largest investors in each other's economies and every day a million British people go to work for US companies in the UK and a million Americans go to work for UK companies in the US".
A giant balloon of Trump as a baby will spend two hours floating over London's historic Parliament Square, close to the houses of parliament, after the mayor of London gave permission to an activist who raised £17,000 ($23,000) for the cause.
Press were asked to don neon orange vests while a flatbed truck was stationed on the tarmac to ensure photographers and cameramen got the best view of Mr Trump's arrival. "But maybe they're taking a little bit of a different route, so I don't know if that's what they voted for". Before embarking on his current trip, Trump said Putin was the easiest of all for him to meet, making his disliking for Washington's old allies evident. Tonight, they will join prominent business figures that include one of Britain's richest men, Sir Jim Ratcliffe at a black-tie dinner at Blenheim Palace in Oxfordshire.
Mr Trump's planned visit has been met with plenty of anger, with 50,000 protesters expected to take to the streets of central London on Friday.
"We in this country, and I hope I do not regret saying this, are very good at this sort of thing".
One tweeter commented that Trump seemed to be "grabbing onto Melania's hand, to keep her from pulling it away, rather than just gently holding it!"
Publican Damien Smyth is an unabashed Trump fan and came up with the idea over a few late-night drinks with a friend.
Opponents have threatened mass protests against the visit, but Mr Trump is expected to avoid areas such as central London where demonstrators could gather.
The President is arriving from Belgium's capital after attending a North Atlantic Treaty Organisation summit in Brussels after he sat down with leaders of the military alliance to discuss its spending on defence.
She will then head to Windsor Castle for tea with Queen Elizabeth II in the afternoon.
Trump flies in after the North Atlantic Treaty Organisation summit in Brussels and leaves Britain on Sunday for talks in Helsinki the following day with Russian President Vladimir Putin.
The pair will then travel to Chequers, the Prime Minister's country residence, for what is being billed as "substantive bilateral talks on a range of foreign policy issues" during a working lunch.