Controversial former Labor leader Mark Latham has recorded a robocall for Pauline Hanson's One Nation as part of her Longman by-election campaign.
Mr Latham led Labor to defeat at the 2004 federal election but has since made a career as a media commentator.
"I'm Mark Latham, former Labor party leader," he says on the recording, played on Sky News on Monday.
"I've had personal experience with Bill Shorten's dishonesty. He just lies and lies and lies."
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Mr Latham says the reason the Longman by-election is occurring is that Mr Shorten "lied" about his MPs' dual citizenship status.
"Whatever you do, don't reward Shorten's dishonesty, don't vote Labor," he says.
"Please support minor parties and independents to shake up the system and put some honest politics back into Canberra
Senator Hanson authorised the ad.
There has been speculation Mr Latham will join One Nation but Senator Hanson explicitly denied any approach had been made or invitation issued for him to do so when the pair appeared together on Sky News on Monday night.

Former Labor leader Mark Latham has recorded ads for Pauline Hanson urging them not to vote Labor. Source: AAP
She told host Paul Murray she'd be "happy to have him on board" but said no approach had been made.
"Mark’s his own person - whether he wants to get involved in politics again, that’s up to Mark," she said.
"If I have Mark beside me on the floor of parliament – fantastic."
Senator Hanson praised the former Labor leader, saying he wasn't afraid to speak his mind.
"I have a lot of time for Mark Latham and his views and as he expresses them," she said.
"I think we need more people like that who are willing to say these issues – because a lot of it’s suppressed."
Mr Latham previously stated he had been approached by four minor political parties to run for office, but has not confirmed if One Nation was one of them.