
British Prime Minister Keir Starmer lost his most senior aide on Sunday as the political crisis over Peter Mandelson's ties to convicted sex offender Jeffrey Epstein threatened to end his leadership 18 months after Labour's landslide election victory.
Morgan McSweeney resigned as Downing Street chief of staff, saying he took "full responsibility" for advising Starmer to appoint Mandelson as UK ambassador to the United States in December 2024.