Suicide prevention advocate and former NRL player Joe Williams said One Nation's decision to release a policy — promoting the use of DNA testing to determine if an individual is Aboriginal enough to get Centrelink payment — is a desperate attempt to win votes.

"They're [One Nation] trying to kick us in the gutter again and put their foot on our throat," the Wiradjuri man told the Daily Liberal.

"We're trying to move forward as a united country and these people are trying to drag us back to the 1800's with blood-quantums and percentages.

"They never made this announcement six months ago because they want to win an election."

One Nation's NSW leader and Legislative Council candidate Mark Latham said if elected, he would attempt to introduce a new, affordable system of Indigenous identification relying on DNA ancestry testing. 

The party says it would end the current system that allows Australians to self-identify as Aboriginal. 

"We will tighten the eligibility rules for Aboriginal identity to require DNA evidence of at least 25 per cent Indigenous — the equivalent of one fully Aboriginal grandparent," One Nation's policy says.

"Australians are sick and tired of seeing people with blonde hair and blue eyes declaring themselves to be Indigenous, when clearly they have no recognisable Aboriginal background and are doing it solely to qualify for extra money."

Mr Williams claimed One Nation is "doing nothing but creating a wedge between Indigenous and non-Indigenous Australians".

"We like and love our non-Indigenous brothers and sisters," he said.

"Aboriginals are easy targets for racists.

"To my knowledge, you can't trace Aboriginality in a DNA test. It's about feeling and connection."