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UK PM's former chief of staff says he was wrong to encourage Mandelson appointment

Published by Global Banking & Finance Review

Posted on April 28, 2026

3 min read

· Last updated: April 28, 2026

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Ex-aide backs UK's Starmer over Mandelson appointment

Controversy Surrounding Mandelson's Appointment as Ambassador

By Elizabeth Piper, Andrew MacAskill and Alistair Smout

LONDON, April 28 (Reuters) - British Prime Minister Keir Starmer's one-time closest aide, Morgan McSweeney, backed his former boss on Tuesday by taking responsibility for promoting the "wrong" appointment of Labour veteran Peter Mandelson as ambassador to Washington.

While describing it as a "serious error of judgment" that cost him his job, however, McSweeney denied having driven the appointment through by instructing officials to ignore procedures or grant clearance.

McSweeney's testimony before a parliamentary committee buttresses Starmer's account in a war of words with former foreign ministry officials over who was responsible for failings around the appointment, and whether the British premier had been told of the risks associated with appointing Mandelson.

McSweeney's Testimony and Admission

'I WAS WRONG'

"I advised the prime minister in support of that appointment, and I was wrong to do so," said McSweeney.

"What I did not do was oversee national security vetting, ask officials to ignore procedures, request that steps should be skipped, or communicate explicitly or implicitly that checks should be cleared at all costs."

McSweeney said he had made clear to Starmer there were "pros and cons" regarding the appointment but the prime minister had decided to go with who he considered to be the best fit for U.S. President Donald Trump's administration.

Political Fallout and Calls for Resignation

The saga over Mandelson's appointment to Britain's highest diplomatic post despite his history and known ties to the late U.S. sex offender Jeffrey Epstein has prompted calls for Starmer's resignation.

Starmer has said he was "wrong" to appoint Mandelson and has expressed regret but says all proper processes were followed. He has also criticised officials for failing to tell him that a security vetting body had advised against the appointment.

Timeline and Urgency of the Appointment

SENSE OF URGENCY

Earlier on Tuesday, a former top British foreign ministry official said there was a clear sense of urgency over the timing of the appointment to make sure the new ambassador was in place "by or around" Trump's inauguration on January 20, 2025.

Philip Barton, who was the top official at the ministry from September 2020 to January 2025, said he had not been consulted on what he described as a political decision and that Starmer's office was "uninterested" in the vetting process for Mandelson to gain security clearance.

Background on Mandelson and Subsequent Developments

Starmer appointed Mandelson in late 2024, hailing his "unrivalled experience". Mandelson, now 72, served as a minister when Labour was last in power more than 15 years ago.

Starmer sacked him last September after emails revealed the depth of Mandelson's ties with Epstein. British police arrested Mandelson in February on suspicion of misconduct in public office but he has not been charged. He does not face allegations of sexual misconduct.

Further Testimonies and Political Ramifications

Pressure on the Appointment Process

Last week, another former top foreign ministry official, Olly Robbins, also said he had faced "constant pressure" to accelerate the appointment. Starmer has denied the accusation.

The row has prompted calls for Starmer to resign for misleading parliament over the appointment, and it has shattered his pre-election promise to provide stable government.

Parliamentary Response

The House of Commons, where the Labour Party has a large majority, voted against a possible inquiry into Starmer over those allegations on Tuesday.

Additional Reporting

(Additional reporting by Sam Tabahriti, Sarah Young and Muvija M; Editing by Kate Holton and Gareth Jones)

Key Takeaways

  • McSweeney accepted that advising Mandelson’s ambassadorial appointment was a ‘serious error of judgment,’ yet denied any misconduct in the vetting process, stating he did not override security checks or urge shortcuts. (apnews.com)
  • The controversy centers on Mandelson’s known links to convicted sex offender Jeffrey Epstein and security concerns that were allegedly raised but overlooked in his appointment pathway. (apnews.com)
  • McSweeney resigned in February amid mounting pressure, saying the appointment had ‘damaged our party, our country and trust in politics itself’; his apology highlights the political fallout and questions over Prime Minister Starmer’s judgment. (scmp.com)

References

Frequently Asked Questions

Who admitted regret over the Mandelson ambassador appointment?
Morgan McSweeney, the former chief of staff to UK Prime Minister Keir Starmer, admitted regret for supporting Peter Mandelson's appointment.
Why was Peter Mandelson considered for the US ambassador role?
McSweeney believed Mandelson could help Britain secure a trade deal with the United States if Donald Trump returned to the White House.
Did McSweeney bypass the official vetting process for the appointment?
No, McSweeney stated he did not circumvent the national security vetting or any official hiring procedures.
What did McSweeney tell the parliamentary committee?
He admitted a serious error in judgment by supporting Mandelson's appointment but denied ignoring procedures or requesting vetting steps be skipped.

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