King Charles III and Queen Camilla laid flowers at the Sept. 11 memorial before stopping by an urban farm, the New York Public Library, a business event and a gala.

Not since his mother, Queen Elizabeth II, traveled to Washington after the Suez Crisis has a visit by the British monarch come at such a fraught point in Anglo-American relations.

The British royals are set to arrive on Monday for a visit hosted by President Trump, with a garden party, an address to Congress and a banquet on the schedule.