Back
POLITICS

PM's ex-chief of staff to give evidence on Mandelson vetting

Morgan McSweeney, the prime minister's former chief of staff, will testify to MPs about his role in the security vetting of Lord Mandelson, whom he advised the PM to appoint as ambassador to the US. The article also notes Robbins's criticisms of Downing Street, the sacking of Robbins, and forthcoming appearances by Cat Little and other senior officials as the vetting row continues to unfold.

Why It Matters

The hearings could shape perceptions of vetting integrity, civil-service relations, and leadership decisions in Downing Street, with potential implications for trust in government appointments.

Timeline

9 Events

April 23, 2026: Cat Little to appear before the committee

April 23, 2026

Cat Little, the most senior civil servant at the Cabinet Office, will appear before the Foreign Affairs Committee on Thursday.

April 22, 2026: Mandelson sacking referenced as seven months after starting

April 22, 2026

The article notes that Lord Mandelson was sacked seven months after starting his ambassadorial position, due to his past friendship with convicted sex offender Jeffrey Epstein.

April 22, 2026: UKSV concerns raised but FO clearance granted

April 22, 2026

Last week, Cabinet Office civil servant Cat Little told Keir Starmer that the UK Security and Vetting team had raised concerns about Mandelson, but the Foreign Office still granted him security clearance.

April 22, 2026: Thornberry confirms Ian Collard and Sir Philip Barton asked to give evidence

April 22, 2026

Committee chair Dame Emily Thornberry said the Foreign Office's Chief Property and Security Officer Ian Collard and former Foreign Office top civil servant Sir Philip Barton have also been asked to give evidence.

April 22, 2026: McSweeney to give evidence next week

April 22, 2026

Morgan McSweeney is expected to give evidence to MPs on the Foreign Affairs Committee next week about his role in Mandelson's security vetting, including whether he pressed civil servants to speed up the process.

April 22, 2026: Prime minister's PMQs defence on Mandelson vetting

April 22, 2026

Sir Keir Starmer defended his actions at Prime Minister's Questions, saying that if the Foreign Office had informed him of vetting concerns, Mandelson would not have been committed to the post.

April 21, 2026: Sir Olly Robbins testifies to Foreign Affairs Committee

April 21, 2026

Sir Olly Robbins gave his version of events to the Foreign Affairs Committee, saying he had not seen UKSV documents and that the case was described to him as 'borderline' with potentially manageable risks. He stated civil service guidelines would have prevented him from sharing vetting details with the prime minister, only giving his final decision.

April 18, 2026: Prime minister sacks Sir Olly Robbins

April 18, 2026

The prime minister effectively sacked former Foreign Office permanent secretary Sir Olly Robbins last week, expressing anger that the Foreign Office had not told him that Mandelson failed security vetting.

February 2026: McSweeney quits Downing Street job

February 2026

In February, Morgan McSweeney left his Downing Street role, saying he took 'full responsibility' for advising the prime minister to appoint Lord Mandelson as ambassador to the United States.