Keir Starmer Facing Calls to Resign over Mandelson Scandal

Keir Starmer is under mounting pressure from opposition parties across the political spectrum after it emerged that Peter Mandelson failed security vetting before being appointed UK Ambassador to the United States, a revelation that has triggered a fresh wave of resignation demands and a major civil service shake-up.

The Guardian first reported on Thursday that Mandelson was initially denied security clearance in late January 2025 after a highly confidential background check by security officials. Despite this, the Foreign Office proceeded to use a rarely used authority to override the recommendation from security officials and grant him the role.

The government said Starmer was not aware that the Foreign Office had overruled the security vetting process until earlier this week. However, that claim has done little to quell a political firestorm. Throughout the affair, Starmer had repeatedly insisted that the necessary vetting rules related to appointing someone to the post of US ambassador were followed, a position now directly contradicted by the Guardian’s reporting.

A Scandal with Deep Roots

The controversy is inseparable from the wider fallout surrounding Mandelson’s links to disgraced sex offender Jeffrey Epstein. Starmer sacked Mandelson as ambassador after documents released by a US Congressional committee revealed new details about the depth of his ties to Epstein.

British police subsequently launched a criminal probe and searched Mandelson’s two houses in London and western England. Mandelson was arrested on 23 February on suspicion of misconduct in public office and released on bail the following morning after more than nine hours of questioning. Mandelson, who has denied doing anything improper, has not been charged.

Police are investigating Mandelson over allegations he leaked sensitive documents to Epstein when he was a government minister, including during the 2008 financial crash.

Days before Mandelson’s arrest, Andrew Mountbatten-Windsor, formerly known as Prince Andrew, was also arrested on the same charge of misconduct in public office. Like Mandelson, King Charles III’s younger brother was a close associate of Epstein.

Civil Service Head Ousted

The political fallout has already claimed one high-profile casualty in Whitehall. Top Foreign Office civil servant Olly Robbins is set to leave his post, having lost the confidence of both the Prime Minister and Foreign Secretary Yvette Cooper over his handling of the vetting process.

The decision to override Mandelson’s failed vetting is said to have taken place over 48 hours in late January 2025. Downing Street sources have described Starmer as “absolutely furious” at the situation.

Opposition Unites in Calls for Resignation

Voices from virtually every corner of the opposition have now called on the Prime Minister to step down.

Conservatives: Conservative leader Kemi Badenoch called it “preposterous” to claim Starmer did not know Mandelson had failed security vetting, saying: “If the prime minister doesn’t know what’s happening in his own office, he shouldn’t be in charge of our country. He should go.”

Liberal Democrats: Liberal Democrat leader Sir Ed Davey accused Starmer of a “catastrophic error of judgment,” adding that if it proved Starmer had misled Parliament and lied to the British public, “he must go.” Davey also said Starmer should have informed Parliament at the earliest opportunity when he learned the truth, rather than waiting for the media to force the story out.

Reform UK and the Greens: The Green Party and Reform UK have also called for the Prime Minister to resign, with leaders Nigel Farage and Zack Polanski both saying that Starmer ‘misled’ parliament and that it’s time for Starmer to ‘do the right thing’ and resign, meaning demands now span the full breadth of Westminster opposition.

Plaid Cymru: Westminster Leader Liz Saville Roberts MP has added her party’s voice to the chorus, stating: “The rushed appointment of Mandelson without the appropriate security clearance was clearly driven more by political convenience and personal connections than by due diligence and scrutiny. It is becoming increasingly clear that Starmer misled the public about what he knew and when. The right thing to do now, for Epstein’s victims and for the public, is for him to resign.”

Saville Roberts also warned that any attempt to withhold documents from the Intelligence and Security Committee could breach parliamentary obligations.

Stephen Flynn, the SNP’s leader in Westminster, also said in a post on X: “The Prime Minister is either incompetent, gullible or a liar. Or all three.”

Documents Row and Parliamentary Pressure

So far, Downing Street has released 147 pages of documents in an attempt to shed light on the case, with further documents set to be released. However, senior government officials are said to be deciding whether to withhold documents about Mandelson failing the vetting process from Parliament.

Withholding documents from the Intelligence and Security Committee could amount to a breach of a parliamentary motion to release “all papers relating to Mandelson’s appointment.”

Reports suggest Starmer may make a statement in the Commons on Monday, though Number 10 has not confirmed whether he will face MPs. The Prime Minister is currently in Paris, co-hosting a summit on reopening the Strait of Hormuz alongside French President Emmanuel Macron.

The Question of Integrity

At the heart of the crisis is not simply a question of process, but of trust. The Prime Minister has apologised for the Mandelson appointment and accused his former envoy of a “litany of deceit” about his Epstein ties. But with multiple opposition leaders now alleging that Starmer himself misled Parliament, the political pressure shows no sign of abating.

Whether Starmer can survive the week with his authority intact may hinge on what those outstanding documents reveal, and whether the public accepts his account that he was kept in the dark by his own Foreign Office until it was too late.

What This Means for the Senedd Election

With polling day on 7 May 2026, just three weeks away, the timing of the Mandelson vetting scandal could hardly be worse for Welsh Labour.

The Senedd election is already being described as the most consequential since devolution began in 1999, and polls have painted a deeply uncomfortable picture for the governing party in Cardiff Bay. Plaid Cymru have led in the majority of large-sample polls conducted in the past year, with Reform UK close behind. Labour, once the dominant force in Welsh politics, has led in just one. The race is shaping up as a three-way contest, with Welsh Labour fighting to avoid being pushed into third place on their own home turf.

The Mandelson affair lands directly on that fault line. For Plaid Cymru, the scandal provides a powerful closing argument: that Wales cannot afford to be governed by a party whose Westminster leadership stands accused of misleading Parliament and prioritising political connections over national security. Liz Saville Roberts’ call for Starmer’s resignation, framed explicitly around justice for Epstein’s victims, is a pitch not just to traditional nationalists but to soft Labour voters who have grown disillusioned with the government in London.

The timing is particularly acute given the new proportional voting system being used for the first time in this election. With seats allocated by party list across 16 constituencies, even modest swings in vote share can translate into significant shifts in seats, meaning late-breaking national stories have the potential to move the dial in ways they would not under the old first-past-the-post system.

For Welsh Labour, the challenge is to create as much distance as possible between themselves and Westminster in the final weeks of the campaign. But with Starmer facing resignation calls from across the political spectrum and fresh revelations potentially still to come as the government releases further documents, that distance may be very difficult to establish.