<p>Peter Mandelson, the problem that won’t go away. Keir Starmer is once again fighting to save his political career, after saying he was not told Mandelson had failed security vetting ahead of his appointment as US ambassador.</p><p>So what really happened? Is this a failure of leadership or does it point to a deeper rot inside Westminster? And either way, can Starmer survive it? </p><p>On this episode of The Fourcast, Krishnan Guru-Murthy was joined by Guardian columnist Polly Toynbee and Conservative MP Alicia Kearns, former chair of the Foreign Affairs Select Committee. </p><p>A Downing Street spokesman told Channel 4 News: “The Foreign Office have run this vetting process, and at no point, at any point in any part of this process was anyone in Number 10, PM or otherwise, informed by the Foreign Office that the recommendation of UK Security Vetting was for him not to pass his developed vetting.”</p>