Prime Minister Keir Starmer will speak to Parliament on Monday after revelations that his pick for U.S. ambassador, Peter Mandelson, failed initial security vetting. The vetting decision, flagged by a specialist team, was overridden by the Foreign Office and never disclosed to Starmer, the government said in the last 24 hours and prompted a swift cabinet shakeup.

When the truth emerged last week, Starmer dismissed Olly Robbins, the Foreign Office’s top civil servant, citing lost confidence. Robbins’ allies argued that UK law barred him from sharing the review's contents, while Starmer’s office maintained that civil servants can flag security recommendations. The dispute has rattled senior officials and raised questions about ministerial oversight.

The episode follows Starmer’s earlier decision to appoint Mandelson, who was later dropped in September amid links to Jeffrey Epstein. Critics claim the prime minister’s choice reflected poor judgment, while supporters say he was unaware of those ties. With local elections looming, the scandal threatens to erode Starmer’s already low approval ratings and his government.

Starmer is expected to deny misleading Parliament, calling the omission of the vetting decision “unforgivable.” Opposition leaders, including Conservative chief Kemi Badenoch, have demanded his resignation, arguing no cover‑up can be tolerated. A committee inquiry will hear Robbins’ testimony next Tuesday, potentially reshaping how security clearances are communicated to ministers and the confidence in government operations.