Monday briefing: How is it possible the prime minister didn’t know about Mandelson’s vetting failure?

In today’s newsletter: As questions mount over transparency and accountability in the ambassadorial appointment process, the political fallout continues to spread across ​Keir Starmer’s government Good morning. Today the prime minister will face parliament in the wake of the Guardian’s exclusive revelation that during the process of appointing Peter Mandelson as ambassador to the US, the former New Labour “prince of darkness” failed UK security vetting – something Keir Starmer says he was not to