Keir Starmer is facing intense scrutiny and calls to resign following revelations that Peter Mandelson, his appointee for US ambassador, failed the rigorous developed security vetting process. Adding to the gravity of the situation, the Foreign Office controversially overruled the recommendation to deny clearance, allowing Mandelson to take up the post, and Starmer was allegedly kept in the dark about this critical information by two top civil servants. These officials, Cabinet Secretary Antonia Romeo and Cabinet Office Permanent Secretary Catherine Little, reportedly knew of the vetting failure since March of the current year but only informed the Prime Minister days ago, prompting Starmer to describe the situation as “unforgivable” and “staggering.”

Mandelson’s appointment as US ambassador was initially announced by Keir Starmer in December 2024. Prior to this, a separate due diligence process had already flagged a “general reputational risk” associated with his appointment. The decision to appoint a high-profile political figure like Mandelson, rather than a career diplomat, was reportedly influenced by Starmer’s then-chief of staff, Morgan McSweeney, who later resigned and took responsibility for the advice.

For his ambassadorial role, Mandelson required Developed Vetting (DV) clearance, which is essential for individuals with frequent and uncontrolled access to top secret material. This comprehensive process, conducted by United Kingdom Security Vetting (UKSV), an agency within the Cabinet Office, involves extensive questionnaires covering finances, internet usage, and security considerations. It also includes an hours-long, intrusive interview that delves into personal life, family, friends, business relationships, sexual history, and substance use. Weeks after his appointment was announced, on January 28, 2025, UKSV concluded that Mandelson should be denied DV clearance, an outcome that is known to be rare.

Despite UKSV’s clear recommendation, the Foreign Office decided on January 30, 2025, to grant Mandelson security clearance, thereby enabling him to assume his duties in Washington. The specific reasons for Mandelson's vetting failure have not been made public, as details of individual DV results are typically confidential. The controversy intensified significantly with the release of Jeffrey Epstein files in September 2025, which exposed the “depth and extent” of Mandelson’s relationship with the disgraced financier, including an email where Mandelson referred to Epstein as “my best pal.” Initially, Starmer defended Mandelson, but facing mounting pressure, he ultimately fired him as ambassador on September 11, 2025, a day after publicly expressing “full confidence” in him.

Keir Starmer has emphatically asserted that he was unaware of Mandelson's vetting failure until Tuesday of this week, nearly 15 months after the Foreign Office overruled UKSV's decision. A summary of the meeting where Starmer was finally informed, provided by Downing Street, confirmed his complete ignorance, including the fact that it was even possible to grant clearance against UKSV advice. Starmer voiced his