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

King Charles says bonds between the U.S. and UK are unbreakable as he addressed a joint meeting of Congress.

King Charles III is only the second British monarch to address a joint session of Congress, after his mother, Queen Elizabeth II, delivered a similar speech in 1991.

The address is a central event of the state visit — the most high-profile of Charles' reign — and will be followed by a state dinner at the White House.

King Charles’ historic speech to the US Congress today has been months in the making, going through various layers of approval. CNN’s Max Foster reports from the White House on what to expect in the King’s address.

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 U.K. and the U.S. will always be staunch allies united in defending democracy,

Britain's King ⁠Charles ⁠will address the U.S. Congress on Tuesday ⁠with a message of unity between the United Kingdom and the United States, promoting ​the "special relationship" at a time of differences between the British government and President Donald Trump over the war on Iran.

King Charles III addressed a joint meeting of Congress on Tuesday, becoming only the second British monarch to do so. CBS News royal contributor Amanda Foreman joins with analysis.