13 July, 2018
Many Britons are opposed to Trump's trip which is not the full state visit he was originally promised with the pomp and ceremony that entails.
May is trying to unify her deeply divided Conservative Party behind her Brexit plans with some of her own lawmakers openly speaking of a leadership challenge.
The 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. "I think they agree with me on immigration".
After spending the night at the USA ambassador's official residence in Regent's Park, London, Mr Trump will join the PM at a military base tomorrow to observe a joint counter-terrorism exercise involving United Kingdom and U.S. special forces.
Donald Trump's son Eric has used his visit to Balmedie to speak about his family's love of Scotland and the UK.
Tens of thousands of people are expected to march through London in protest against Mr Trump's visit and some of his actions during his first 18 months in power.
Mrs May will host Mr Trump and his wife Melania at a lavish dinner at Blenheim Palace this evening.
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Trump has clashed in the past with May - even though she is a conservative who shares his view that defense spending should be raised - and with her predecessor, David Cameron, who challenged Trump's anti-Muslim campaign stance as "divisive, stupid and wrong". While saying that he didn't have any message or advice, he added: "I would say Brexit is Brexit..."
When asked about the demonstrations, he replied: "It's fine".
Instead, the couple arrived via helicopter and was driven by presidential "Beast" limousine onto the property, where they were welcomed by May and her husband Philip.
However, the Scottish Government approved the plans with the UK Supreme Court eventually rejecting Mr Trump's legal challenge in 2015.
Both the leaders are expected to hold talks on the military alliance between the two nations.
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".
In a statement, the group said it was a "victory that Donald Trump does not appear to have any official engagements in London".