King Charles III is undertaking a state visit to the US amid strained diplomatic relations. The trip aims to improve relations despite disagreements over tariffs and ongoing global conflicts.

Call it the royal trump card: King Charles dispatched to Washington on a state visit at the lowest point in the Special Relationship in at least seven decades. We'll ask if catering to Donald Trump's enthusiasm for the British crown can dispel the bad blood over tariffs, the war in Iran... and repeated jibes by the U-S president to make Canada the 51st state, Canada a Commonwealth member whose head of state is the same Charles the Third invited to address Congress and feted at a state dinner.