Pauline Hanson will help lead a parliamentary inquiry into family law even after launching an extraordinary attack against women who she claims are lying about domestic violence in the family courts.
The Senate agreed on Wednesday to set up the special committee, to be chaired by veteran Liberal MP Kevin Andrews with Senator Hanson as his deputy, despite opposition from Labor and the Greens.
The One Nation leader says some women are making up domestic violence allegations or falsely accusing ex-partners of molesting their children.
"There are people out there who are nothing but liars and who will use that in the court system," she told ABC radio on Wednesday.
"Don't throw domestic violence orders against your ex-partners just to further your case or get control of the children."
Senator Hanson did not provide any evidence to substantiate her claims, other than citing her own son's experience with the courts.
When repeatedly pressed, she suggested contacting men's rights groups to back up her allegations.
Labor said these comments were completely unacceptable and while it would have been happy to talk to the government about an examination of family law, it wouldn't back one with Senator Hanson at the helm.
"It would appear from those comments that Pauline Hanson has already judged what that evidence is and is saying that people don't tell the truth about family violence," Opposition Leader Anthony Albanese told reporters in Canberra.
"These are difficult issues for families out there. They are particularly difficult for women. The issue of domestic violence should be taken seriously by everyone in this place."
Mr Andrews said for his part, he was approaching the issues objectively.
"I will try to endeavour to enable everybody who wants to have a say, to have a fair say," he told ABC TV.
"That does not mean we will necessarily agree with everyone. Part of the role of a parliamentary committee is to question what people are putting forward."
Prime Minister Scott Morrison insisted the inquiry wasn't about picking sides but having an "honest ear" to the concerns of people going through the family courts system.
Men's groups have applauded the upcoming investigation but it's been met with fierce criticism from anti-domestic violence campaigners.
It comes barely two years after another parliamentary inquiry into the family courts, and just months after the Law Reform Commission undertook its own review.
Prominent anti-domestic violence campaigner Rosie Batty is furious with the decision to launch yet another inquiry.
And she said it was unacceptable for politicians with their own agendas to lead it.
"We know the failings, we need to start investing in this court system that is broken, overwhelmed and failing. It is continuing to put families, particularly children, in danger," she said.
The two Centre Alliance senators backed the inquiry, but the party's Rex Patrick wouldn't back Senator Hanson's stance.
"While we accept that some people may perjure themselves in a court, we totally reject Senator Hanson's sweeping generalisation that women lie in court in order to get favourable decisions," he told AAP.
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