On a four-day US visit, the King will use quiet diplomacy to urge the President and Congress to stay closely aligned with Europe. A White House meeting opens efforts to warm a strained special relationship and reaffirm Britain’s friendship, with sensitive messages delivered privately.

Charles III’s state visit to the US will proceed with tighter security after an individual was detained near the White House correspondents’ dinner; authorities say the US President and aides were likely targets. Both governments hope the trip will strengthen the special relationship.

Senior ministers are holding private talks on who should urge the Labour leader to step down, as mood around No 10 shifts from optimism to alarm. Calls for him to quit are expected after the 7 May local elections, with debate over sending a single envoy or a delegation.

Donald Trump has authorised the US Navy to use lethal force against Iranian boats that threaten vessels in the Strait of Hormuz, after talks faltered. The move escalates tensions in the Gulf, increasing risks to shipping and miscalculation as both sides entrench.