King Charles made a rare address to a joint session of U.S. Congress on Tuesday, leaning heavily into themes of unity, democracy and the pursuit of peace.
In his speech, the king said the two countries should be united in "an era that is, in many ways, more volatile and more dangerous" than the time of his mother's reign.
U.S. President Donald Trump later heaped praise on Charles and the U.K. at a state dinner in the evening, suggesting he and the monarch agreed on his rationale for the war with Iran.
The visit comes as tensions between the U.S. and U.K. have flared over the U.S.-Israeli conflict against Tehran. "We meet in times of great uncertainty," the King told Congress.