Keir Starmer has said it is “staggering” he was not informed that Peter Mandelson failed initial security vetting before being appointed UK ambassador to the United States.
The controversy follows reports that vetting officers had raised concerns about Mandelson’s suitability, but the appointment still went ahead after being approved within the Foreign Office.
Starmer said he only became aware of the issue this week, despite previously telling Parliament that proper procedures had been followed. He described the situation as “unforgivable” and insisted that neither he nor other ministers had been informed at the time.
The prime minister now faces political pressure, with opposition figures calling for his resignation. Kemi Badenoch said the government’s explanation was “completely preposterous” and suggested the situation could lead to further consequences.
Mandelson was first announced for the diplomatic role in December 2024 and formally took up the post in early 2025. He was later dismissed after reports linked him to Jeffrey Epstein, a convicted sex offender.
A government statement said ministers were not required under existing rules to be informed about the outcome of security vetting decisions at the time. Senior minister Darren Jones defended Starmer, saying the prime minister had not misled Parliament.
Starmer has said he will address lawmakers in Parliament to provide full transparency on the issue and outline the facts surrounding the appointment.