Trump's royal "special honor" was no more than standard working-visit protocol, royal experts say. Royal commentator Richard Fitzwilliams described Trump as looking as if he were "wandering down a golf course" during the honor guard inspection.
On the day Trump arrived in the U.K., the queen was wearing a brooch given to her by Barack and Michelle Obama.
Tens of thousands of people took to the streets to tell Donald Trump he was not welcome in London.
The president sent the British press into a frenzy with a controversial interview to begin his U.K. trip.
"I guess when they put out blimps to make me feel unwelcome, no reason for me to go to London," the president said.
The president will spend the vast majority of his time outside of London.
Prime Minister Theresa May will host a black-tie dinner at the historic stately home to welcome U.S. president to the U.K.
The president watched a Churchill biopic and is keen to tour the museum.