Sir Keir Starmer could face a Parliamentary sleaze inquiry into claims he lied to MPs over the Peter Mandelson scandal.
The Commons will vote on Tuesday whether to refer the Prime Minister to the Privileges Committee to consider if he misled the House over the way Lord Mandelson’s appointment as ambassador to the US was handled.
Commons Speaker Sir Lindsay Hoyle allowed a vote on the issue following requests from Tory leader Kemi Badenoch and other senior MPs.
Cabinet minister Emma Reynolds accused the Tories of playing “silly political games” over the issue.
The Government took the unusual step on Monday of publishing a letter from former cabinet secretary Sir Chris Wormald to the Prime Minister, in which the head of the Civil Service said he had concluded the “appropriate processes were followed” in both the appointment and sacking of the peer.
In the message dated September 16, Sir Chris, who conducted a review into Lord Mandelson’s appointment, said he would “keep this under review if any further evidence emerges”.
Meanwhile, Sir Keir is expected to address backbenchers at a meeting of the Parliamentary Labour Party (PLP) on Monday evening ahead of the crunch vote.
The Speaker’s decision now gives the Labour leadership a headache in deciding whether to order Sir Keir’s MPs to publicly oppose a referral to the committee.
Chief Secretary to the Prime Minister Darren Jones refused to tell the Commons whether Labour would whip their MPs against it.
The committee was responsible for Boris Johnson’s exit from frontline politics after it investigated him for misleading the House over the “partygate” breaches of Covid-19 laws in Downing Street.
He quit as an MP in 2023 before the committee published a report recommending his suspension.
Tory leader Mrs Badenoch called for Labour MPs to back the referral to the Privileges Committee.
Keir Starmer misled Parliament, sacked officials for his own failures, and risked national security with Mandelson’s appointment.
— Kemi Badenoch (@KemiBadenoch) April 27, 2026
MPs will now vote on referring him to the Privileges Committee.
The Prime Minister should be held to the same standards he held others. pic.twitter.com/KAjVQVjwHV
She said: “The Prime Minister misled the House of Commons repeatedly.
“He appointed a national security risk and friend of a convicted paedophile to be our ambassador in Washington, our most sensitive diplomatic post.
“He pretended that full due process was followed for this appointment. It was not.
“He has blamed the appointment on officials when the blame can only be placed at his own door.”
Liberal Democrat leader Sir Ed Davey said Labour MPs must be given a free vote on Tuesday.
“Even Boris Johnson didn’t block his MPs voting for scrutiny,” he said.
“If Keir Starmer has misled the House and the public, he must be held to the same standard that we should expect of any Prime Minister.”
Reform UK leader Nigel Farage told the Press Association: “There’s no doubt he’s misled Parliament more than once and not just on this issue, on others as well.
“I suspect what will happen is the Labour MPs will be three-line whipped to support the Government, a handful will abstain, and we’ll just move on from here.
“Starmer’s future will be decided by the elections on May 7 and if Reform do as well as I think we can in the old Labour areas, that will be the end of him.”
The Prime Minister has been accused of misleading MPs by saying that “full due process” was followed in appointing Lord Mandelson, who was given developed vetting status despite failing security checks.
The Foreign Office, under then top civil servant Sir Olly Robbins cleared him despite red flags raised by experts at the UK Security Vetting agency responsible for the checks.
Sir Keir has also faced questions for telling MPs that “no pressure existed whatsoever in relation to this case”.
Sir Olly told MPs “my office and the Foreign Secretary’s office were under constant pressure” about the appointment in January 2025, after it had been announced but before the security checks were completed.
Sir Keir told The Sunday Times he was not talking about the “everyday pressure of government” but the suggestion of specific pressure on Sir Olly to grant Lord Mandelson’s developed vetting status.
“(Sir Olly) was really clear in his mind that wasn’t pressure that was put on him. And he also goes on to say that none of this impacted his decision,” Sir Keir said.
Downing Street suggested the timing of the move was driven by next week’s elections to English councils and the Scottish and Welsh parliaments.
A No 10 spokesman said: “The Government is engaging with the two parliamentary processes that are already running on Peter Mandelson’s appointment with full transparency.
“This is a desperate political stunt by the Conservative Party the week before the May elections because they have no answers on the cost of living or the NHS. Their claims have no substance.”
The Government has promised to comply with an order by MPs to disclose documents relating to Lord Mandelson’s appointment to the Washington post, which ended after nine months in September 2025 when he was sacked over the extent of his links to paedophile financier Jeffrey Epstein.
Mr Jones said more than 300 documents would have been passed to Parliament’s Intelligence and Security Committee by the end of Monday, which have been judged to be prejudicial to “national security or international relations”.
These include “a number that are relevant” to Lord Mandelson’s vetting for the role of US ambassador, he told MPs in a statement.
The Commons Foreign Affairs Committee is also examining how Lord Mandelson was granted security clearance.
Sir Olly, who was sacked by Sir Keir for not disclosing the security concerns to ministers, gave evidence to the committee last week.
On Tuesday the MPs are due to hear from Sir Keir’s former chief of staff, Morgan McSweeney, widely regarded as a protege of Lord Mandelson.
He resigned in February over his part in the peer getting the coveted job.
The committee will also hear from Sir Olly’s predecessor, Sir Philip Barton, and receive written evidence from Foreign Office official Ian Collard, who briefed Sir Olly on the vetting findings.
Sir Olly said he was told the security experts who carried out the vetting deemed Lord Mandelson a “borderline” case and leaned towards recommending that clearance be denied, but the former Foreign Office mandarin approved his developed vetting status with mitigations put in place.
Downing Street has said the findings from UK Security Vetting, the agency which carried out the checks, were more clear-cut, describing Lord Mandelson as of “high concern” and recommending that he be denied clearance.
