Wrangling over the dossier’s release came as Sir Keir Starmer called on Conservative MPs to oust Boris Johnson over the fine the Prime Minister received for attending his own birthday gathering in June 2020.
Mr Johnson is set to make a statement to Parliament on Tuesday about the fine. He is expected to apologise for breaking the rules, but insist he was not aware he had done so.
He will then meet Tory MPs on Tuesday evening for a “clear the air” discussion, designed to shore up support ahead of Wednesday – when he is likely to face a vote that could see him face another investigation.
The Telegraph understands opposition parties have submitted letters to Sir Lindsay Hoyle, the Speaker of the House of Commons, calling for a vote on whether to refer the Prime Minister to the Commons privileges committee. That committee would investigate whether Mr Johnson intentionally misled MPs over “partygate”.
If he was found to have broken the rules, Mr Johnson could be suspended from Parliament for a contempt of privilege.
Labour sources said the party was still considering its options on how best to depose Mr Johnson, but Sir Keir said the decision was up to Conservative MPs.
“The Cabinet, ministers and Tory MPs must realise this is not going to change and every time they defend Boris Johnson, they embroil themselves in his web of lies,” he said.
“Only Conservative MPs have the power to bring this shameful saga to a close.
“If the Prime Minister is not going to resign, then they must take action when Parliament returns this week to send a clear message that honesty and integrity in public life still matters.”