Addressing a gathering of the Parliamentary Labour Party on Monday night, Sir Keir additionally advised his MPs: “Tomorrow is pure politics and we need to stand together against it.”
The BBC understands Labour MPs are prone to be whipped to vote down the Conservative movement to refer him to the Privileges Committee fairly than being given a free vote.
The vote will happen on the identical day that former senior authorities figures are on account of give proof to the Foreign Affairs Committee, together with the prime minister’s former chief of workers Morgan McSweeney and former senior civil servant on the Foreign Office Sir Philip Barton.
Conservative chief Kemi Badenoch mentioned Sir Keir had misled Parliament “multiple times” on the topic.
She urged Labour MPs to “look into their consciences” and again an inquiry by the Privileges Committee.
A Downing Street spokesperson mentioned the claims from the Conservatives “have no substance” and the federal government is “engaging with the two parliamentary processes that are already running” on Lord Mandelson’s appointment “with full transparency”.
These embody: the requirement to publish paperwork associated to Lord Mandelson’s appointment via a process referred to as a humble tackle; and the Foreign Affairs Committee holding proof classes to evaluate the vetting course of.
On Monday, the federal government published a letter from September 2025, external wherein the then-head of the Civil Service Sir Chris Wormald advised the prime minister that “appropriate processes” have been adopted within the appointment.
Written proof from the Foreign Office accomplished in session with Ian Collard, the civil servant who was head of safety within the division, was additionally revealed on Monday by the Foreign Affairs Committee.
It famous that Collard “felt pressure to deliver a rapid outcome” on Lord Mandelson’s vetting clearance on account of “regular contact from No 10” to the workplace of the division’s everlasting under-secretary.
It added Collard “did not personally speak to colleagues in No 10” and he “does not assess that this pressure influenced the professional judgement that was reached by himself or his team”.
Labour has a majority within the House of Commons, so numerous its backbench MPs must vote for an inquiry or abstain to ensure that one to be launched.
The BBC has been advised that cupboard ministers have been ringing spherical Labour MPs to persuade them to again the prime minister and vote in opposition to referring the matter to the Privileges Committee.
The committee can look into instances of MPs breaking parliamentary guidelines and in 2023 it ruled that the previous Prime Minister Boris Johnson had misled MPs about events in Downing Street throughout Covid.
The Ministerial Code states that ministers who knowingly mislead Parliament are anticipated to resign, whereas any inadvertent error needs to be corrected “at the earliest opportunity”.
At the beginning of parliamentary enterprise on Monday, Sir Lindsay mentioned “numerous” MPs, together with the Conservative chief, had requested him to permit a vote on holding an inquiry.
He emphasised that his function was “as a gatekeeper” to make sure such votes have been held “sparingly” and that he was not taking a view on the rights and wrongs of the case.
The order paper revealed forward of Tuesday’s movement exhibits MPs might be requested to notice Sir Keir’s statements that “full due process” was adopted in Lord Mandelson’s appointment, that “Sir Olly Robbins was absolutely clear that nobody put pressure on him” to make the appointment and “no pressure whatsoever exists in relation to this case”.
