Labor in dirty preference deal: Greens

The Australian Greens are crying foul over reports Labor may not preference them at the re-run of the West Australian Senate election.

There's speculation Labor's left faction is pushing to give minor parties preferences above the Greens.

Greens leader Christine Milne said Labor was risking handing absolute power to the Abbott government to the detriment of the country.

"This is all about their internal factions trying to shut the Greens out of parliament," she told reporters in Canberra.

At the 2013 federal election Labor preferenced the Greens second, while the Greens preferenced Labor after nine other minor parties.

Greens WA senator Scott Ludlam is facing an uphill battle to retain his seat.

He narrowly won on a recount in 2013, but last month the High Court declared the result of the election void after the Australian Electoral Commission lost 1370 ballots.

The group voting tickets for the WA poll, which will indicate the preference flow, will be published on March 15.

Labor Senator Louise Pratt, who retained her seat after the initial count but lost out in the recount, would not be drawn on the preferencing speculation.

"Those negotiations are underway and they're very fluid," Ms Pratt told reporters in Perth.

"They haven't reached a conclusion so I couldn't tell you anything about that."

But she said she believed West Australians would be wary of voting for micro-parties at the April 5 election.