The trip is being planned to coincide with a visit Trump is making to a NATO summit in Brussels.
Activists, however, have had plans for major demonstrations laid out for months in expectation of the US leader's visit to the UK.
The trip - coming after French president Emmanuel Macron's successful visit to Washington this week - is being called a "working visit" meaning it will not carry the full pomp and ceremony of a state visit, though Downing Street said one of those was also still being planned.
The working visit is set to go ahead in July, with the likely date being Friday 13 July.
Trump cancelled a previously planned trip to London to open the US embassy in January, criticizing its move from Grosvenor Square to an "off location" south of the Thames as a "bad deal".
But news reports at the time suggested that the threat of mass protests may have played a part in the cancellation.
Fear of bad publicity is also thought to have been behind the lack of progress in scheduling the state visit, which British Prime Minister Theresa May invited the president to in January 2017.
Source: News Agencies, Edited by website team