Labour Party legislator Paul Flynn, who has criticized Trump in Parliament, says Trump has outraged Britons - and people around the world - with his harsh treatment of immigrants.
Assistant Chief Constable Chris Shead, from the National Police Coordination Centre, said: "Police forces are working together on a significant, multi-faceted security operation supporting the presidential visit to the UK".
The UK Royal Air Force celebrates 100 years
The Duchess of Cambridge appeared to make a special gesture to involve her tragic mother-in-law in her grandson's christening. Earlier Charlotte stole hearts around the world with her impeccable manners at the christening of baby brother Prince Louis .
The trek, coming more than a year and a half into his presidency, does not have the trappings of a state visit.
Mr Trump is believed to be spending the weekend playing golf at his Turnberry resort in South Ayrshire, which he bought in 2014, although there has been no official confirmation of his plans.
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.
"You see, what's going on throughout the world with immigration..."
The trip includes meetings with Prime Minister Theresa May, who has described the United States as Britain's strongest ally, and is determined to secure a trade deal after the country acts on Brexit and leaves the European Union in March 2019.
UK Conservatives in Quagmire as Two More Vice Chairs Defect From Party
If a further 47 Conservative MPs send in letters it will trigger a vote of confidence in the leader. Johnson was quickly replaced by 51-year-old former Health Minister Jeremy Hunt, who unlike Mr.
Shrugging off the plans for mass protests, which will include a giant baby-shaped blimp bearing Trump's features, he said in Brussels: "They like me a lot in the UK".
While Trump on Friday is having lunch with Prime Minister Theresa May at her Chequers country estate or sipping tea with Queen Elizabeth II at Windsor Castle, tens of thousands of demonstrators - maybe more - are planning to gather in London's Trafalgar Square to protest the president and his policies.
"I think that's why Brexit happened", he told a news conference before flying to Stansted Airport north of London.
Similar protests are planned on Thursday evening outside the USA ambassador's home at Regent's Park and in Scotland when Mr Trump visits on Saturday.
Later, Trump will take tea with Queen Elizabeth II at Windsor Castle, a home to the royals for 1,000 years, part of a tour created to keep him away from protesters.
Trump pushes allies for immediate military spending increase
Trump has called on allied countries to meet or exceed the 2014 Wales summit goal of spending 2 percent GDP on defense spending. Despite the friendly rhetoric, U.S. -Russia relations have soured since Trump's presidency.