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MPs who engage in the abuse and sexual harassment of women must be held accountable, Jeremy Corbyn will warn.

The Labour leader says a "warped and degrading culture" - where the abuse of women is accepted and normalised - is thriving in the corridors of power at Westminster.

In a keynote speech on Saturday, he will urge women who have suffered such treatment to take their complaints to their party organisation, the Commons authorities or - if necessary - the police.

Speaking at Unite the union's Scottish policy conference in Aviemore, he will say that Labour "will not tolerate any form of discrimination or harassment".

Earlier, Mr Corbyn was forced to fend off accusations he had been slow to act in the case of Labour backbencher Jared O'Mara, who is under investigation for his use of offensive language.

The Sheffield Hallam MP - who is accused of calling a constituent an "ugly b****", a claim he denies - was suspended by the party on Wednesday, two days after a series of misogynistic homophobic online postings first came to light.

Mr Corbyn's intervention comes amid reports that female researchers and aides in Parliament have been using a WhatsApp group to share information about alleged abusive behaviour by MPs from both the main parties.

In his speech, the Labour leader will say, in the wake of the allegations about movie mogul Harvey Weinstein, it was clear sexual harassment was not a problem confined to Hollywood.

"Misogyny and sexism are widespread problems across society. Sexual abuse and abusive treatment of women by men is not confined to any one industry, workplace or institution," he is expected to say.

"It is rooted in unequal power relationships that treat women as subordinate to men, and a culture where the abuse of women has often been accepted and normalised.

"The problem doesn't stop with those who make unwanted advances on women, it extends to a culture that has tolerated abuse for far too long.

"It's a warped and degrading culture that also exists and thrives in the corridors of power, including in Westminster."

Mr Corbyn will say too often women have not been listened to when they spoke out in the past and that there must be "zero tolerance" of such harassment and abusive behaviour.

"This needs to be a turning point. Any Members of Parliament who have engaged in this sort of behaviour must be held to account," he will say.

"I urge anyone with any complaints to come forward, to their party organisations or for those working in Parliament, the Commons authorities, or to the police where appropriate.

"As leader of the Labour Party, I want to make it absolutely clear that our party will not tolerate any form of discrimination or harassment."