Labour has received a formal complaint over the conduct of MP Geraint Davies, who has been suspended by the party pending an investigation into reports of “incredibly serious allegations of completely unacceptable behaviour”.
A woman has submitted the complaint, according to the website Politico, which earlier reported that five other women had made sexual harassment claims against the veteran politician.
The decision to administratively suspend the Swansea West MP means he will have the whip removed in Westminster while a review is carried out.
The website said it had spoken to more than 20 serving MPs and Labour staff who described allegations of inappropriate behaviour stretching back at least five years.
A Labour spokeswoman said: “These are incredibly serious allegations of completely unacceptable behaviour.
“We strongly encourage anyone with a complaint to come forward to the Labour Party’s investigation.
“Any complainant will have access to an independent support service who provide confidential and independent guidance and advice from external experts throughout the process.”
Labour is currently carrying out its own investigation into the claims made against Mr Davies.
Daniel Greenberg, the Parliamentary Commissioner for Standards, could also decide to open his own inquiry if he suspects the code of conduct for MPs may have been breached.
Labour is also reviewing the formal processes for complaints to be made, the party’s general secretary David Evans said in an email to staff.
Mr Davies is also facing allegations that he “boasted” about bringing sex workers into Parliament for drinks.
Sky News, which reported the claims, cited an unnamed Labour MP who alleged that Mr Davies “would openly boast about bringing escorts and prostitutes onto the terrace and show them off”.
It is the latest set of claims made in what has been termed the “Pestminster scandal”, in which allegations of inappropriate sexual behaviour have been made against MPs or other senior figures in Parliament in recent years.
Mr Hill resigned as an MP before the panel could impose a sanction for his behaviour.
Former City of Chester Labour MP Christian Matheson quit in October after a report by the watchdog upheld complaints of “serious sexual misconduct”.
While Boris Johnson faced pressure due to the lockdown partygate scandal, it was Conservative complaints about his handling of assault allegations against former deputy chief whip Chris Pincher that led to his premiership collapsing last year.
Neil Parish, the former Tory MP for Tiverton and Honiton, sparked a by-election after admitting in April 2022 to watching pornography while in the House of Commons.
Shadow immigration minister Stephen Kinnock said Labour’s whips are “very alive” to the issue of sexual misconduct in Westminster.
He told Times Radio: “The key thing is that, when something like this happens, a formal complaint must be made.
“And I do genuinely believe that our whips and our party is very alive to this issue.
“People get suspended, they lose the whip, investigations take place.
“I think we need to make that happen as rapidly and effectively as possible and make sure that anyone who does feel that they have a complaint to make that they know that they can do so in confidence, and that they will be treated with respect and confidentiality and with action will be taken.”
Mr Davies has been contacted for comment.