UK Prime Minister Starmer faces Parliament over Peter Mandelson's ambassador appointment after failed security vetting

British Prime Minister Keir Starmer faces parliamentary questioning over his appointment of Peter Mandelson as U.S. ambassador despite Mandelson having failed security vetting. Top civil servant Olly Robbins was fired after The Guardian revealed the vetting failure. Opposition parties and some Labour figures have called for Starmer's resignation, with Starmer claiming he was not informed of the failed vetting before making the appointment.