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 told about.On Friday, Starmer said he was “absolutely furious” and described the situation as “totally unacceptable”. But the episode has once again raised questions about his political judgment, with opposition parties – and some of his own MPs – calling for his resignation.Iran | Tehran is not planning to take part in new talks with the US in Islamabad, Iranian state media reported, as its military accused America of violating a fragile ceasefire by attacking a cargo ship.US news | At least eight children were killed and two adults wounded in a mass shooting in Shreveport, Louisiana. …