The President and the King

Mr. Brown is the author, most recently, of “Q: A Voyage Around the Queen.” He wrote from Suffolk, England.

King Charles III of Britain touched down for a state visit on Monday at a moment when relations with the United States are particularly fragile. But despite President Trump being so unpopular in Britain that around half of Britons thought the visit should be canceled, it’s going ahead — with increased security, after the shooting on Saturday night at the White House correspondents’ dinner.

Winston Churchill’s belief, first expressed in 1946,........

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