It was a day of pomp and pageantry as the Trumps visited Buckingham Palace to meet with the queen.
So what did President Trump tell Queen Elizabeth II? Inside Edition asked expert lip reader Larry Wenig to explain what the two were chatting about.
It was a cordial exchange, with the queen telling Trump "thank you" and "well, so you're here," before gesturing at him to follow her.
"Come along," she said, according to Wenig.
The day was not without controversy, however.
Some wondered whether Trump and his wife, Melania Trump, accidentally insulted the queen by not bowing or curtsying for her, but Americans aren't actually required to greet the British royal so formally.
What appeared to be a fist bump between Trump and the queen caught the attention of many as well. It turned out it was just an awkward handshake.
The trip is also being overshadowed by Trump's ongoing feud with the mayor of London, Sadiq Khan, who has called the American president a fascist and global threat.
Just before he landed in the United Kingdom, Trump shot back on Twitter, saying Khan is a "stone cold loser who should focus on crime in London, not me."