A Tory MP is today ­sensationally accused of a boozy ­sexual ­assault on a male Labour MP in a cab.

The Conservative, also male, is now among a dozen MPs who could lose their seats in the growing storm around the Westminster sex harassment scandal.

Labour rights campaigner John Mann is compiling a little black book of the ­offenders as new allegations continue to swirl through the Commons.

Mr Mann, 57, the MP for Bassetlaw in Nottinghamshire, said: “There will be at least 12 by-elections as a result of this.

“There are also going to have to be more Cabinet resignations.”

It is alleged that the incident involving the two male MPs happened in 2014 after a night out drinking.

There were suggestions a date rape drug might have been used.

The victim did not want to talk about what happened.

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Another Tory MP nicknamed the Lift Lunger is one of 40 MPs accused in a “dirty dossier” circulating at Westminster.

Sources claimed he had acted ­inappropriately in Commons lifts with female MPs by touching them and that staffers were warned not to get in lifts with him alone.

A Tory MP said he had reported the Lift Lunger to Government whips in 2010. There was astonishment when he was subsequently given a promotion by the then PM David Cameron.

The MP said: “I reported him after the General Election that year when a number of new female MPs raised ­concerns about him.”

The MP in question denies any inappropriate behaviour and says he is unaware of any reports on him in the whips’ office.

Mr Mann will be ­presenting evidence of Labour misconduct to Jeremy Corbyn once he has finished ­collecting it.

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The latest allegations came after the Tories suspended Dover MP Charlie Elphicke after referring “serious allegations” to ­police on Friday.

Married Mr Elphicke, 46, denies any wrongdoing and complained about how the Tory Party tipped off the media before telling him of his suspension.

The party’s new chief whip Julian Smith was two days into his new job when he issued a statement announcing Mr Elphicke’s suspension.

Mr Smith replaced Gavin Williamson who is Britain’s new Defence Secretary. The Dover and Deal Conservative Association backed their MP saying he is “professional and dedicated” and “innocent until proven guilty”.

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Theresa May, Labour leader Jeremy Corbyn and Lib Dem leader Vince Cable will meet tomorrow with the four other Parliamentary party leaders to design a new safeguarding system for MPs and staff. The Prime Minister said: “There is a vital need to provide better support and protection for the thousands of staff working in Westminster and in ­constituency offices.”

If she gets her way, individual parties will no longer have their own grievance procedures but just one which will apply to all. Having lost Defence Secretary Sir Michael Fallon, 65, to the scandal, Mrs May is praying she will not also see her close friend and First Secretary of State Damian Green, 61, being forced to resign.

Tory activist Kate Maltby, 31, claims that Mr Green may have ­fleetingly touched her knee in 2015 and sent her a “suggestive” text ­message when she posed in a corset for a newspaper. Mr Green denies any inappropriate behaviour and has instructed libel lawyers.

Ms Maltby’s claims are now being investigated by the Cabinet Office.

Michael Fallon's resignation speech

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Sir Michael quit after it was ­revealed he repeatedly touched broadcaster Julia Hartley-Brewer’s knee at a dinner 15 years ago.

She had threatened to punch him in the face if he did it again. They remained on friendly terms but in the frenzy for fresh allegations the story emerged again last week.

Also popping into the mix ­unexpectedly was Commons leader Andrea Leadsom, 54.

She reportedly claimed to No10 that Sir Michael made lewd ­comments to her when they both sat on the Treasury Select Committee for two years from 2010.

Today Mr Corbyn will use a speech at his party’s North West conference in Blackpool to warn that abuse of power is no longer tolerable.

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His remarks follow criticism for appointing now suspended Labour MP Kelvin Hopkins, 76, to the ­shadow cabinet after sex allegations against him had surfaced.

Mr Hopkins denies the allegations. Mr Corbyn will say: “Labour is ­committed not just to challenging a warped and degrading culture in Westminster, and across ­society, but to overturning it. We must make this a turning point and a ­moment of real change.”

Scotland’s childcare minister Mark McDonald resigned yesterday over allegations about his ­private life.

The Scottish Nationalist Party member for Aberdeen Donside apologised ­“unreservedly to anyone I have upset or who might have found my behaviour inappropriate”.