A professional lip reader has claimed to pick up on a tense exchange between Donald Trump and King Charles III, with Queen Camilla present, during their arrival in the United States.

The King, 77, and Camilla, 78, landed in Washington, D.C. on April 27 for a four-day state visit. They were welcomed by officials and greeted by children from British military families before walking through a ceremonial honor guard formed by U.S. service members.