UK Government Releases Thousands of Pages of Documents on Peter Mandelson's Appointment as US Ambassador

Jun 1, 2026

The UK government has released over 1,500 pages of documents detailing Peter Mandelson's controversial appointment as U.S. ambassador. The files reveal Mandelson's private criticisms of Prime Minister Keir Starmer's leadership, calling him lacking in "verve." The release follows Mandelson's firing over his ties to Jeffrey Epstein and a failed security vetting, fueling a political crisis for Starmer's government.

Mandelson appointment document release

▪The released documents include private correspondence such as vetting emails and personal WhatsApp messages.
▪The UK government released a second batch of over 1,500 pages of documents on June 1, 2026, related to Peter Mandelson's U.S. ambassador appointment.

Epstein relationship security vetting

▪Peter Mandelson failed his security vetting in January 2025, but the decision was overruled by the Foreign Office.
▪Prime Minister Keir Starmer was warned of the "reputational risks" associated with Mandelson's ties to Epstein before the appointment.
▪Mandelson was fired over the extent of his relationship with the late convicted sex offender Jeffrey Epstein.
▪Peter Mandelson was appointed UK ambassador to the U.S. in February 2025 and was fired seven months later in September 2025.
▪According to reports, Mandelson was advised by civil servants to provide "artificial" information to vetting staff about his personal and business connections.
▪In February 2026, Peter Mandelson was arrested on suspicion of misconduct in public office and remains under police investigation for allegedly leaking information to Jeffrey Epstein.

Mandelson criticism of Starmer

▪In May 2025 WhatsApp messages to minister Pat McFadden, Peter Mandelson said Prime Minister Keir Starmer "lacks verve".
▪Mandelson also wrote that most staff in No. 10 "don't think Keir knows what he wants".
▪In the same exchange, Mandelson stated that the Cabinet as a whole lacks verve and needs "more people who can execute".
▪In July 2025 messages, Mandelson described No. 10 Downing Street as "beleaguered and bereft" and in need of a "complete revamp".

Ministerial accountability political fallout

▪In a WhatsApp message, senior minister Pat McFadden complained that Labour MPs were asking the "wrong questions," focusing on "who can we tax in order to pay benefits to others".
▪The controversy over Mandelson's appointment led to the resignation of Morgan McSweeney, Prime Minister Starmer's chief-of-staff.
▪Prime Minister Keir Starmer apologized to Parliament in April 2026, stating, "I should not have appointed Peter Mandelson."
▪David Lammy, who was Foreign Secretary at the time of the appointment, apologized for his role and said he deeply regretted it.
▪The Mandelson affair has become a focus for criticism of Prime Minister Starmer, who faces a possible leadership challenge.

Ambassador correspondence diplomatic protocol

▪In an email about the gift, Mandelson said he had "gone tonto," a British slang term for going crazy.
▪As ambassador, Mandelson expressed frustration over delays in procuring a personalized red dispatch box as a gift for U.S. President Donald Trump.
▪In a November 2024 handwritten note to then-Foreign Secretary David Lammy, Mandelson pledged, "if you were minded to appoint me, I would make sure you never regret it."