Boris Johnson has been accused of using a “distraction tactic” after calling for an MP on the Privileges Committee to resign over allegations of lockdown rule-breaking.

A fresh row erupted on the eve of a long-awaited report that is poised to find the former prime minister misled parliament over partygate.

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In a dramatic twist on Wednesday evening, Mr Johnson and his allies called on senior Tory MP Sir Bernard Jenkin to “explain his actions” and resign from the inquiry, following a report which claimed he attended a drinks reception in December 2020.

Mr Johnson called the allegations “nauseating” – but he was accused of attempting to distract from the report’s findings by opposition MPs, while a source close to the committee reportedly dismissed the intervention as “desperate stuff”.

According to the Guido Fawkes website, Sir Bernard went to a drinks party held by Commons Deputy Speaker Dame Eleanor Laing in December 2020, while London was in Tier 2 measures restricting indoor mixing.

Responding to the claims, Mr Johnson said: “Bernard Jenkin has just voted to expel me from parliament for allegedly trying to conceal from parliament my knowledge of illicit events.

“Now it turns out he may have for the whole time known that he himself attended an event – and concealed this from the Privileges Committee and the whole House for the last year.

“To borrow the language of the committee, if this is the case, he ‘must have known’ he was in breach of the rules.

“He has no choice but to explain himself.”

Mr Johnson also wrote to committee chair Harriet Harman demanding that she clarify whether she checked that panel members had not attended such events before the inquiry began.

In a rancorous letter, he wrote that if the report was true, Sir Bernard was “guilty of flagrant and monstrous hypocrisy” and “he should have recused himself” from the investigation.

“I really find it incredible – and nauseating – that this matter is emerging at this stage of your process.”

Sir Bernard has been contacted while a representative for Dame Eleanor declined to comment.

Lord Peter Cruddas, a Tory donor who Mr Johnson elevated to the Lords, called for the police to investigate.

‘Tories in full blown civil war’

But Lib Dem deputy leader Daisy Cooper said: “This a typical distraction tactic from Boris Johnson that doesn’t change the fact he broke the law and lied about it

She said: “The Conservative Party is now in a full blown civil war, while people struggle to afford to pay their mortgage or get a GP appointment. This whole unedifying spectacle needs to brought to an end as soon as possible.

“We need a general election now to finally get rid of this chaotic Conservative government.”

Last year, Mr Johnson received one of the 126 fines the Met Police issued over lockdown breaching events at Downing Street and Whitehall during the pandemic.

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He resisted calls to resign at the time but was brought down months later by the collapse of support within his own government following his handling of the Chris Pincher affair.

The Privileges report, which Mr Johnson has already quit as an MP over, is poised conclude that the former prime minister deliberately misled parliament with his repeated assurances that COVID rules were followed at all times.

Mr Johnson has denied lying and railed against what he branded the “kangaroo court” as he stood down as an MP on Friday after receiving their findings.

Sky News understands the Privileges Committee report is still expected to be published at 9am on Thursday.

According to The Independent, a source close to the committee called Mr Johnson’s statement a “desperate” last-ditch attempt to discredit their work and pointed out they are ruling on his claims in the Commons rather than the gatherings themselves.

The Tory-majority panel, chaired by Labour’s Harriet Harman, has spent almost a year investigating whether Mr Johnson committed a contempt of parliament by misleading MPs either recklessly or deliberately by denying the rule-breaking parties in Number 10.

The former Conservative leader’s resignation means he will not serve the lengthy suspension likely to be recommended, but Mr Johnson could be refused a parliamentary pass offered to former MPs, a sanction imposed on former speaker John Bercow after a bullying report.

It comes as Mr Johnson is embroiled in a public spat with Prime Minister Rishi Sunak over his resignation honours list.

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This was published hours before his dramatic exit from the Commons on Friday and omitted the names of his close allies Nadine Dorries and Nigel Adams, who have also resigned as MPs.

The Tories are now facing three potentially damaging by-elections, but Labour leader Sir Keir Starmer is also pressing for a general election.

He ended PMQs on Wednesday by hitting out at the “Tory chaos”.

He told Mr Sunak: “End the boasting, the excuses, the Tory chaos, see if he can finally find somebody, anybody, anywhere to vote for him and call a general election now.”