Keir Starmer’s future is in the balance after a crisis over the appointment of Peter Mandelson as ambassador to Washington claimed the UK prime minister’s closest aide.

Keir Starmer’s future is in the balance after a crisis over the appointment of Peter Mandelson as ambassador to Washington claimed the UK prime minister’s closest aide.

Keir Starmer’s Chief of Staff Morgan McSweeney quit his post on Sunday, becoming the casualty of a furor over the decision to appoint Peter Mandelson as the UK’s ambassador to Washington that now threatens the prime minister’s own position.