The Greens have called for laws to prevent the introduction of "Trump-style far-right politics" after a Labor video depicting Opposition Leader Jess Wilson and One Nation leader Warren Pickering sparked backlash.
The AI-generated video, posted on Victorian Labor's Instagram page five days earlier, could cause confusion and undermine public trust in politics, one expert said.
Ms Wilson appears in the video trick-or-treating alongside an AI-generated Mr Pickering, warning voters a future Liberal government would introduce "Americanised healthcare".
"If you had a heart attack you would have to pay $150,000 for care," the video, using Ms Wilson's face and voice, falsely claims.
Voters should not be forced to become detectives when consuming election content, Swinburne University AI expert Atie Kia said.
"Repeated exposure could actually leave people less certain about genuine recordings, more cynical about political communications," she told AAP.
"We are going to lose the trust of the voters."
Despite her warning, Dr Kia expects AI-generated content to increase in the lead-up to the November 28 poll.
An AI-created video posted to the Victorian Liberal Party's Instagram page on Melbourne Cup Day showed Premier Ben Carroll in a jockey outfit sleeping on a horse, a reference to a Herald Sun report he had formed a habit of taking naps on the job.
One Nation's Victorian deputy leader Colleen Harkin previously denied an AI -generated official campaign video was racist after it portrayed a young man of African appearance wielding a machete and a suicide bomber who appeared to be of Middle Eastern descent.
Victorian Greens leader Ellen Sandell on Thursday called for a ban on AI-generated political deepfakes and truth in political advertising laws.
"We do not want that Trump-style far-right politics coming here to Victoria, and that's why we need to draw a line," she said.
"It's very dangerous for our democracy when voters (are) intentionally being deceived and can't trust what is before them."Â
Treasurer Colin Brooks argued Labor's deepfake video was a "real representation of those people" but no one would be fooled into thinking it was genuine footage.
"There have been a number of fake videos from other parties, Liberals and One Nation, for a couple of weeks now, and I don't think Labor should be held to a different standard," he said.
Federal Greens leader David Shoebridge raised the alarm about AI deepfakes ahead of the 2025 federal election.
South Australia already has laws banning misleading political advertising and deceptive AI-generated election material, while NSW has also introduced restrictions on political deepfakes.
Mr Brooks used the day of campaigning to tout internal Labor analysis that found a $6.35 billion shortfall in Liberal Party election pledge costings.
A 63-page booklet labelled "Jess Wilson's Dodgy Costings" distributed to reporters detailed a series of reportedly under-costed coalition policies, including an $883 million gap on its centrepiece elective surgery waitlist pitch.
"This is the most poorly costed, dodgy liberal election platform in Victoria's history," Mr Brooks said.
But Ms Wilson said she would not be lectured by a Labor government on budgeting for its promises.
"Our policies are costed by the independent Parliamentary Budget Office and will be released in the usual way, the usual time," she said.
Late on Thursday, she said she would go head-to-head with Premier Ben Carroll in a leaders' debate on the Nine Network on November 12 after weeks of speculation about whether the showdown would go ahead.
But Labor poured cold water on the idea, claiming special treatment was offered by Nine to change the format of the debate.
Mr Carroll would only accept a debate with both Ms Wilson and One Nation leader Warren Pickering, a Labor spokesperson said.
Another debate that includes Mr Carroll, Ms Wilson and the leaders of the Greens and One Nation will be held on November 17.
