King Charles III arrives in Washington on Monday for a four-day state visit aimed at celebrating the United States’ 250th anniversary. The trip comes amid strained trans-Atlantic ties that are partly over disagreements between the U.K. government and President Donald Trump over issues including the Iran war. Trump has praised Charles but criticized Prime Minister Keir Starmer for not supporting military action. The visit includes a White House state dinner and a speech to Congress. Concerns exist about potential embarrassments especially given Trump’s recent contentious remarks.  A shooting incident at a Washington dinner attended by Trump sparked a last-minute security review. Buckingham Palace said the trip would go ahead as planned.