New Delhi, April 28 -- King Charles III is set to deliver a rare address to a joint session of the US Congress on Tuesday (April 27) at 3 p.m. ET, marking only the second time a reigning British monarch has spoken before American lawmakers.

The only previous instance dates back to May 16, 1991, when his mother, Queen Elizabeth II, addressed the Congress, highlighting the enduring alliance and shared democratic values between the United Kingdom and the United States.

Addresses to a joint session of Congress are reserved for the world's most prominent leaders. Besides Queen Elizabeth II, only a handful of global figures such as Winston Churchill, Pope Francis and Vaclav Havel have received the honour.

Charles' speech underscores both the...