Following the departure of senior figures, including foreign minister Boris Johnson and Brexit minister David Davis, the political atmosphere is febrile.
On terrorism: After coming under fire for re-tweeting anti-Muslim videos posted online by the deputy leader of the far-right Britain First group, Jayda Fransen, the president said Theresa May should focus on "destructive radical Islamic terrorism" in the United Kingdom, rather than on him.
Protests are expected against Trump, whose policies - including a travel ban on a number of predominantly Muslim countries, the detention of child migrants on the US-Mexico border and the imposition of tariffs on European Union steel and aluminium exports - have all been criticised by the UK.
US President Donald Trump gives a thumbs up while he and Britain's Prime Minister Theresa May take part in a family photo at the start of the North Atlantic Treaty Organisation summit in Brussels.
On Thursday, Trump will travel to Blenheim Palace, the 18th-century mansion where Britain's World War Two leader Winston Churchill was born and spent most of his childhood. From there his meetings with Mrs May will be at her country home, Chequers, which offers a "more informal setting", according to a Downing Street spokesman.
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.
Protests are expected at every stop Trump makes along the way, including a caricature blimp of him as a baby holding a smartphone flown near Parliament on Friday.
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Mr Smyth said he hoped the protests, and specifically the Trump baby blimp, do not upset the American public.
"I just want the people to be happy".
Meanwhile, in the capital city thousands will gather in a various of protests to voice their views against the USA president, including a march that could be attended by as many as 50,000 people and a flying protest involving the "Baby Trump" balloon.
The organizers claim that flying the balloon is their right "pursuant to the rights of Freedom of Assembly and of Association", as well as the right to protest peacefully.
Unlike visits from previous presidents, he won't be spending much time in London after his arrival.
With the president set to travel to Scotland on Friday evening after meeting the Queen at Windsor Castle, a protest is planned for Glasgow's George Square.
For protesters in Edinburgh they have a particularly varied day to look forward to. Events will include "toss the welly at Trump" and a Trump coconut shy.