Talks with Prime Minister Theresa May, a meeting with Queen Elizabeth II and a trip to Scotland all made Trump's schedule for his three-day United Kingdom visit beginning Friday. A baby-shaped Trump balloon is expected to fly over Parliament on Friday morning.
Asad Rehman, 51, one of the organizers of a massive protest planned for central London, said that among the motivations behind the protest was to show solidarity with Americans across the Atlantic who also oppose Trump.
The President's itinerary has been drawn up to largely avoid heavily populated areas, and the widespread protests which are nearly certain to mark his first "working visit" to Britain.
The US embassy's alert to American citizens was an unusual step, CNN reported.
President Trump: "I think they like me a lot in the U.K".
But it's not simply the protesters, who are expected to dog Mr. Trump throughout his visit, including his weekend in Scotland, but his fraught relationship with political leaders accustomed to harmonious exchanges with US leaders, a tradition of unity that goes back at least to the vital World War II partnership of Franklin D. Roosevelt and Winston Churchill.
Mr Mundell said he is looking forward to welcoming the president.
Fresh from a North Atlantic Treaty Organisation summit where Trump chided Germany and other European nations for failing to contribute enough to defence spending, British Prime Minister Theresa May is hoping his trip will boost the close ties between their two nations and help forge a future free trade deal.
Trump "has proudly sparked passionate often divisive emotions about things, I think Americans living here to eager to turn out and express their views", he said.
"So that was the full planning that went into it - 10 pints of stout and, you know, late-night conversation."
They will attend a black-tie dinner with Theresa May, before meeting the Queen in Windsor on Friday.
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.
"There is definitely a sense that Britain needs America more because of Brexit", said Bronwen Maddox, head of the Institute for Government, a think tank.
Nicola Sturgeon made it clear that she would be prepared to meet Mr Trump but no...
Protesters are set to descend on the Regent's Park residence, with plans to blare out recordings of children crying for their parents at U.S. detention centres.