A protest was expected to take place near Blenheim Palace in Oxfordshire, the venue for President Trump " s black-tie dinner with Theresa May.
While Britain regards the United States as its closest ally, Trump's comments on militant attacks in Britain and his retweeting of anti-Muslim videos posted by a leader of a far-right UK group have sparked anger.
Despite not being an official state visit, the Government is desperate to ensure the U.S. leader feels he is being treated with the appropriate level of pomp and ceremony.
Prior to coming to London, the president claimed a personal victory at a North Atlantic Treaty Organisation summit after telling European allies to increase spending or lose Washington's support.
The exterior of The Trump Arms public house, formally named The Jameson, which has embraced the arrival of US President Donald Trump for a visit by changing its name and decorating its interior with Trump memorabilia, is seen in West London on July 12, 2018.
Trump's victory in the 2016 presidential election shocked British diplomats in Washington and relations between May, a vicar's daughter, and the president have been strained at times.
She says they have "turned a blind eye" to the situation.
"I believe that the people in the UK - Scotland, Ireland, as you know I have property in Ireland, I have property all over - I think that those people they like me a lot and they agree with me on immigration". Meanwhile, other protests will simultaneously be held at other places in the city, with London Mayor Sadiq Khan giving permission for a giant inflatable Trump baby to fly over Parliament.
Blenheim Palace is the birthplace of Winston Churchill, one of Trump's heroes and whose bust is on display in the Oval Office.
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"It's a disastrous and divisive time, and Trump is very much part of that", he said.
May has had to defend Trump's visit in the face of fiery criticism from opposition lawmakers.
While Mr Johnson may now be a backbencher, Mr Trump said he hoped he would still see the former foreign minister - another blow to the fragile position of Mrs May.
Trump's wife is also concerned about how the British people will be viewing her and her husband during the trip.
When the United Kingdom leaves the EU, May said that "there will be no alliance more important in the years ahead", the BBC noted. "Now, for the benefit of all our people, let us work together to build a more prosperous future", she said in excerpts released in advance.
The President, who is set for a two-day working visit followed by a weekend in Scotland, addressed the planned protests in a news conference, saying, "I think it's fine".
"I've been reading a lot about Brexit over the last couple of days and it seems to be turning a little bit differently where they're getting at least partially involved back with the European Union", he told reporters.
Trump will depart Britain Friday for Finland to prepare for a summit with Russian President Vladimir Putin Monday in Helsinki.