The battle for Sussan Ley's former seat in regional New South Wales has descended into chaos after a One Nation volunteer was recorded in a shocking verbal attack on Liberal Senator James Paterson.
The incident, which was captured on video, shows the volunteer at a pre-polling booth in Albury in the seat of Farrer launching into a foul-mouthed tirade at Paterson over the One Nation candidate David Farley's previous ties to the Labor Party.
"You're a lying b***h," the volunteer can be heard saying before things appeared to turn physical.
One Nation has since issued an apology for the incident and says the party would support a police investigation if one is requested.
Paterson said in a statement: "Robust debate on polling booths is a healthy thing but it should never get physical.
"Anyone standing for public office has to accept legitimate scrutiny about their record, including One Nation.
"Voters have a right to know David Farley was a Labor member, aspiring candidate and donor before they make their decision about who represents them in Farrer."
Farrer is a southern New South Wales electorate taking in the regional cities of Albury and Griffith.
The by-election will be held on Saturday.
