In a rare address to lawmakers during his first visit as king, Charles kept his speech largely apolitical and focused on the U.S. and U.K.'s alliance.

The British monarch used an address before Congress to hail the relationship between the U.S. and the U.K. – but also to subtly point out a couple things that could be better.

Britain's King Charles told the U.S. Congress on Tuesday that despite an age of uncertainty ⁠and conflict ⁠in Europe and the Middle East, the UK and the U.S. will always ⁠be staunch allies united in defending democracy,

Britain's King Charles told the U.S. Congress on Tuesday (April 28) that despite an age of uncertainty and conflict in Europe and the Middle East, the UK and the U.S. will always be staunch allies united in defending democracy.

King Charles III delivers a rare address to a joint meeting of Congress during his first state visit to the United States

Following meetings with the president and first lady on Tuesday, the royal couple traveled to Capitol Hill, where King Charles III became the second British monarch to address a joint meeting of Congress after his mother in 1991.

So the King's goal has been to ease those tensions with a royal charm offensive, most notably with his joint address to Congress on Tuesday afternoon. There is some reason for hope. President Donald Trump has a notably mercurial personality.

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