Sir Keir Starmer’s former chief of staff Morgan McSweeney has been summoned to appear before the Foreign Affairs Committee next week amid the Lord Peter Mandelson vetting scandal.
Mr McSweeney, widely regarded as a protege of Lord Mandelson, resigned in February over his part in the peer’s appointment to the role of US ambassador.
The political strategist will appear at the influential parliamentary committee on Tuesday, after an expected showing on Thursday morning by Cat Little, the most senior Cabinet Office civil servant.
Ms Little last week revealed to the Prime Minister that she had discovered Lord Mandelson had been granted high-level security clearance for the prestigious job in Washington despite vetting officials recommending against it.
Their appearances at the Foreign Affairs Committee (FAC) follow that of former Foreign Office chief Sir Olly Robbins, who was sacked by the Prime Minister last week for not telling him about the details of the vetting decision.
Writing on social media, FAC chairwoman Dame Emily Thornberry said Sir Olly’s predecessor Sir Phillip Barton was among those called to give evidence.
Dame Emily said: “Following Sir Olly’s evidence, the Foreign Affairs Committee has today requested that Cat Little, Ian Collard, Sir Philip Barton and Morgan McSweeney attend and give evidence.
“Cat Little will give evidence tomorrow at 9am.
“Morgan McSweeney will attend Tuesday.”
Following Sir Olly's evidence, the Foreign Affairs Committee has today requested that Cat Little, Ian Collard, Sir Philip Barton and Morgan McSweeney attend and give evidence.
— Emily Thornberry (@EmilyThornberry) April 22, 2026
Cat Little will give evidence tomorrow at 9am.
Morgan McSweeney will attend Tuesday.
Sir Keir insisted at Prime Minister’s Questions on Wednesday that Sir Olly’s evidence about Lord Mandelson exonerated him over accusations that he had misled MPs.
The mandarin’s testimony “puts to bed all the allegations levelled at me by those opposite in relation to dishonesty”, the Prime Minister said.
The leaders of opposition parties had called for Sir Keir to resign for misleading MPs about the appointment process, as news that Lord Mandelson was cleared for the Washington posting against the recommendation of security officials appeared to contradict his previous statements that due process was followed.
But the defiant Prime Minister told MPs: “Last week, they were all saying that it must have been shared with me. Sir Olly was very clear yesterday, it was not. I believe not sharing it was a serious error of judgment.
“That information should have been shared with me and other ministers, and if it had have been, Mandelson would not have been committed to post.”
Mrs Badenoch said Sir Keir should quit for failing to follow the recommendation to get security clearance for Lord Mandelson before making the appointment.
She said: “We all heard Sir Olly Robbins’ testimony yesterday.
“The head of the Foreign Office was sacked for the Prime Minister’s own failings.
“His backbenchers know that is not fair. Even his most loyal Cabinet members won’t defend it.
“The Prime Minister did not follow the process the Cabinet Secretary set out in November 2024, he knows he did not follow due process, yet he told the House he had.
“I cannot accuse the Prime Minister of deliberately misleading the House, but everyone can see what has happened here. This was not due process.
“Everyone knows the price of misleading the House. Will the Prime Minister finally take responsibility and go?”
Sir Keir defended his decision to sack Sir Olly, saying he should have been told about the “red flags” raised by the UK Security Vetting agency.
However, Work and Pensions Secretary Pat McFadden, a close ally of the Prime Minister, repeatedly declined to say the decision to sack Sir Olly was fair.
Mr McFadden said he thought “very highly” of Sir Olly but told Times Radio: “I think if the Prime Minister’s made the judgment that he’s not got confidence in the head of the Foreign Office, the head of the foreign service, then it’s difficult to continue.”
Asked for a second time if it was fair, Mr McFadden said: “Look, it’s the Prime Minister’s judgment.”
When he was asked the same question again, Mr McFadden said: “As a Cabinet member, I support the Prime Minister’s decisions.”
During Prime Minister’s Questions, Sir Keir would not deny that Downing Street considered giving his former spin doctor Lord Matthew Doyle a diplomatic job.
The Prime Minister said there were “often conversations about other roles” when staff leave jobs “in any organisation” as he faced scrutiny over claims by Sir Olly that No 10 had initiated discussions with him about potentially finding an ambassadorship for Lord Doyle.
The peer had the Labour whip withdrawn earlier this year after it emerged he had campaigned on behalf of a friend who had been charged with possessing indecent images of children.
The peer, who stepped down as the Prime Minister’s communications chief last March, said in a statement on Tuesday that he had “never sought” a head of mission, ambassador “or any equivalent leadership-type posting”.
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