U.K. leader’s chief of staff quits over appointment of Mandelson as ambassador despite Epstein ties

British Prime Minister Keir Starmer, right, talks with Britain's ambassador to the United States Peter Mandelson during a welcome reception at the ambassador's residence on Wednesday, Feb. 26, 2025 in Washington. (Carl Court/Pool Photo via AP, file)

LONDON — British Prime Minister Keir Starmer’s chief of staff resigned Sunday over the furor surrounding the appointment of Peter Mandelson as the U.K. ambassador to the U.S. despite his ties to Jeffrey Epstein.

Morgan McSweeney said he took responsibility for advising Starmer to appoint Mandelson, 72, to Britain’s most important diplomatic post in 2024.

“The decision to appoint Peter Mandelson was wrong. He has damaged our party, our country and trust in politics itself,” McSweeney said in a statement. “When asked, I advised the Prime Minister to make that appointment and I take full responsibility for that advice.”

Starmer is facing a political storm and questions about his judgement after newly published documents, part of a huge trove of Epstein files made public in the United States, suggested that Mandelson sent market-sensitive information to the convicted sex offender when he was the U.K. government’s business secretary during the 2008 financial crisis.

Starmer’s government has promised to release its own emails and other documentation related to Mandelson’s appointment, which it says will show that Mandelson misled officials.

Mandelson, a former Cabinet minister, ambassador and elder statesman of the governing Labour Party, has not been arrested or charged.

Metropolitan Police officers searched Mandelson’s London home and another property linked to him on Friday. Police said the investigation is complex and will require “a significant amount of further evidence gathering and analysis.”

Starmer had fired Mandelson in September from his ambassadorial job over earlier revelations about his Epstein ties. But critics say the emails recently published by the U.S. Justice Department have brought serious concerns about Starmer’s judgment to the fore. They argue that he should have known better than to appoint Mandelson in the first place.