Although hundreds of thousands of people protested against him during a trip a year ago, Mr Trump said instead of demonstrations, there had been "tremendous crowds of well-wishers". He was asked if he recognised it and he said "no"!
After lunch, the Trumps viewed an exhibit of artifacts from the royal collection that had ties to the United States, including an 18th century map of NY, a pewter horse statuette Trump gave the queen a year ago and older photos of golfers.
The first couple was treated to view the royal gift collection at the palace, which will be followed by a tour of Westminster Abbey, tea with Prince Charles and Camilla and state banquet with the Queen. Trump and Charles wore suits. A formal tea hosted by Prince Charles brought together a future king who has warned repeatedly about the perils of climate change and a president who is actively dismantling USA policies created to slow global warming.
The first day of the visit ended with an extravagant state dinner at the palace.
Mr President, as we look to the future, I am confident that our common values and shared interests will continue to unite us.
Then, as he greeted the queen, Trump appeared to fist bump her.
It also said Trump's "well documented misogyny and vulgarity" disqualified him from meeting the Queen or other British royals. "The bond between our nations was forever sealed in that great crusade".
Among these he listed freedom, sovereignty, self-determination and the rule of law.
But away from the pageantry, Trump is set to make his trip the most unconventional state visit in recent British history.
Khan described Trump as "just one of the most egregious examples of a growing global threat" and compared the language he had used to that of the "fascists of the 20th century". Trump called Markle "nasty" during an interview with The Sun, after he learned she came out against his 2016 candidacy, calling him "misogynistic" and "divisive".
London Mayor Sadiq Khan speaks at the British Chamber of Commerce annual conference in London, Britain, March 28, 2019.
Writing in his column for Mail Online, the former Britain's Got Talent judge said: "Sadiq Khan, who's been Mayor for three years, launched a series of savage attacks on President Trump in the past 48 hours, both in print and on television".