Prime Minister Keir Starmer of the United Kingdom speaks to reporters during a meeting with President Donald Trump in Turnberry, Scotland, on July 28, 2025. Starmer announced his resignation on Monday, June 22, 2026, bowing to a mutiny inside his Labour Party and paving the way for Andy Burnham, the former mayor of Greater Manchester, to likely become the country’s next leader. (Tierney L. Cross/The New York Times) By MICHAEL D. SHEAR For months, he tried desperately to avoid this moment. But…