WASHINGTON, April 28 -- Britain's King Charles III met Donald Trump at the White House Monday, kicking off a high-stakes state visit shadowed by transatlantic tensions and a new alleged attempt to assassinate the US president.

Behind the warm welcome for Charles and Queen Camilla in front of the cameras lay a deepening rift in the so-called "special relationship" between Washington and London over Trump's war in Iran.

With such tensions simmering, Charles will address a joint meeting of Congress on Tuesday, when he will tell US lawmakers that the long history between the two countries is one of "reconciliation and renewal," according to a released excerpt from the king's speech.

In mild Washington sunshine, Charles and Trump exchanged ...