Parliament Square
The 20ft effigy is expected to appear above Parliament Square on Tuesday - the second day of the US president's London visit.
“We would like to thank Londoners for opening their hearts and demonstrating their willingness to act on that truth."
At least 750 people have been arrested since Monday, in what the Met called an "unprecedented" operation.
"Peaceful protest has a long, rich history in Parliament Square. Sad to see this action taken."
Nigel Farage and Stephen Yaxley-Lennon spoke as thousands marched to Westminster.
Demonstrators are demanding a final say on Brexit be put to the people.
The traffic around Parliament Square in London was momentarily halted by a group of women protesting against the pension age. The protesters were calling on the government to move the pensionable age back to 60. They say that thousands of women have been left in financial difficulties and even destitution because of a lack of information regarding the change.
"If people want to spend their Saturday looking at me in a yellow bikini they’re welcome to do so."
Three people were treated at the scene following the crash.
As the 'carnival of resistance' packs up for the day, the president flies to Scotland.