Mandelson vetting scandal deepens, Starmer faces backlash over oversight failures

Peter Mandelson's brief return as ambassador to Washington has become a test of Keir Starmer’s authority, after it emerged the Foreign Office overruled its own vetting agency to clear him for one of Britain’s most sensitive diplomatic posts. The decision now threatens to eclipse the original scandal, shifting attention from Mandelson’s ties to Jeffrey Epstein to the prime minister’s judgment, staffing choices and grip on government.

Mandelson was appointed in December 2024 and took up the job on 10 February 2025, despite UK Security Vetting, the Cabinet Office agency responsible for security checks, recommending against clearance. Developed Vetting is required for access to top secret material, making the overrule especially significant. The ambassadorial posting ended on 11 September 2025, after fresh information emerged about Mandelson’s relationship with Epstein and emails in which he backed Epstein’s efforts to challenge his 2008 conviction.

The fallout widened sharply on 17 April 2026, when Starmer said he was furious that he had not been told Mandelson had failed the vetting process. Conservative leader Kemi Badenoch said Starmer’s position was untenable and renewed calls for him to resign. The charge against the prime minister is no longer only that Mandelson was a poor appointment, but that No 10 may not have had proper control over a process involving access to top secret material and a senior diplomatic post in Washington.

Starmer has said he will go to Parliament on Monday, 20 April 2026, to set out the facts, while the Foreign Affairs Committee has asked former Foreign Office permanent under-secretary Sir Olly Robbins to give evidence on Tuesday, 21 April 2026. The Foreign Office has said neither Starmer nor any minister knew Mandelson had been granted clearance against the vetting recommendation until this week, but that explanation has not stopped questions over ministerial accountability, or over whether Starmer misled Parliament when he previously said the usual process had been followed.

For Starmer, the danger is no longer confined to Mandelson’s past. It now reaches into the machinery of government itself, with critics asking how a veteran Labour figure, a former MP for Hartlepool from 1992 to 2004, a European commissioner from 2004 to 2008, a Cabinet minister under Tony Blair and Gordon Brown, and a life peer since 2008, could be sent to Washington without the system that checked him properly understood at the top.