LONDON (AP) — Senior Cabinet ministers on Sunday rallied around U.K. Prime Minister Keir Starmer, whose leadership is teetering over his decision to give Britain’s most important diplomatic job to Peter Mandelson , a scandal-tarnished politician and friend of Jeffrey Epstein . Starmer will face restive lawmakers in Parliament Monday to fight for his job after the explosive revelation that Mandelson was appointed ambassador to the United States despite failing security checks . Starmer says he’s