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."
Mr Latham says the reason the Longman by-election is occurring is because 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 the pair appeared together on Sky News on Monday night.