The US president is known for his brash disdain of free trade deals and multilateral institutions like the World Trade Organization.
Unlike with Prime Minister Theresa May earlier in the day and in previous meetings, Mr Trump did not attempt to hold the hand of his female host as they came down the stairs to inspect the troops. "Mary Jo Jacobi, a former aide to President Ronald Reagan, told CNBC's "Squawk Box Europe", that "[Trump] has already won, he is meeting with the queen and his lifelong wish has been meeting with the Her Majesty so from his personal perspective it is a win already".
His gaffes were slammed on social media, with Joanna Gasiorowska, Al Jazeera senior sports presenter tweeting, 'I can't even watch this... She says "it's brilliant. I met her on a number of occasions". "She wanted to go a different route".
It prompted Mr Trump to say it made him "feel unwelcome" in the city, on his second day of a four-day United Kingdom visit.
'I used to love London as a city.
The official royal website states: "There are no obligatory codes of behaviour when meeting The Queen or a member of the Royal Family". Two senior ministers resigned in protest this week at her plans for trade with the European Union after Britain leaves the bloc next March.More news: Riyad Mahrez: I want to win the Champions League with Manchester City
And the rule is very clear - she needs to lead the way no matter what!
Some Brexit supporters have cast May's Brexit plan as a betrayal, including MPs in her own deeply-divided party who have warned of a leadership challenge.
The U.S. President said that he felt unwelcome in London after hearing of the "Trump baby" blimp initiative.
US President Donald Trump stands alongside Prime Minister Theresa May this morning at Chequers.
"We have a rich history in this country of having a sense of humour as well".
"Now, for the benefit of all our people, let us work together to build a more prosperous future".
When Mr Trump first took office past year, Downing Street was consumed by eagerness to ensure Mrs May was his first worldwide visitor at the White House. The president was expected to stay the weekend in Scotland at his Turnberry golf property.