After arriving at Bleneim Palace, Trump was met by the prime minister and her husband, Philip.
First lady Melania Trump pulled out all the stops and truly dressed to impress as she and President Trump made their way to a black-tie dinner hosted by Prime Minister Theresa May at Blenheim Palace on Thursday evening. Mr Trump is hardly likely to catch a glimpse of the six metre giant orange inflatable blimp that depicts him as a screaming baby. After the visit, Trump will decamp to Finland for a one-on-one with Russian President Vladimir Putin on July 16.
Mr. Trump, however, suggested before leaving a North Atlantic Treaty Organisation summit in Brussels on Thursday to head for London, that Britons in general agree with his policies, in particular his tough stance on immigration.
The baby blimp of President Trump is due to be flown over London this week.
He has clashed in the past with May - even though she is a fellow conservative who shares his view that defense spending should be hiked - and with her predecessor, David Cameron, who challenged Mr. Trump's anti-Muslim campaign stance as "divisive, stupid and wrong".
The trek, coming more than a year and a half into his presidency, does not have the trappings of a state visit.
While the many thousands are expected to line the streets and protest against Trump, politicians have become involved too.
"The people voted to break it up, so I imagine that's what they'll do".
PGA and LPGA partner with Aon to offer US$1m annual prize
The Dell Technologies Championship, formerly the Deutsche Bank Championship, ends after its 2018 event. The Players' Championship is also moving from May to mid-March.
He added that it seemed as if the United Kingdom was "getting at least partially involved back with the European Union".
Just hours after May's foreign minister, Boris Johnson, resigned and complained that the Brexit dream was being suffocated, Trump said he might speak to him during the trip.
"I think that those people, they like me a lot and they agree with me on immigration, and I think that's why they had Brexit in the first place-because of immigration", he said.
In a statement ahead of Trump's arrival, she said the visit would focus on trade and strengthening defence and security ties, saying there was no stronger alliance than Britain's "special relationship with the USA".
May hopes Trump, who landed at Stansted airport before flying by helicopter to the United States ambassador's London residence, will help to accelerate a future free trade deal, though his public comments on Brexit cast a shadow over the visit.
"Now, for the benefit of all our people, let us work together to build a more prosperous future".
Later, asked about Theresa May's plan for leaving the European Union, he echoed the British Prime Minister's own words that "Brexit should mean Brexit".
While it is not unusual for heads of state to visit Windsor Castle or meet the UK Prime Minister in her country home, it is quite unusual for an American president not to spend any time in London.
Dozens of demonstrations are planned throughout the country with the largest expected to take place in central London on Friday. He is scheduled to meet May and then Queen Elizabeth II before leaving Friday.