The Morrison government is facing a major task to hold on to at least two of its Perth seats, including that of Attorney-General Christian Porter.
Polling for Seven West Media, published on Sunday, shows the primary vote for the Liberal party has slumped in Pearce, Swan and Cowan compared to the 2016 federal election.
Mr Porter, who holds Pearce with a margin of 3.7 per cent, is losing votes to One Nation on five per cent of the primary vote and Clive Palmer's United Australia Party is on two per cent.
The Liberal's primary has fallen from 45.4 per cent in July 2016 to 40 per cent, while Labor has improved its primary support from 44.3 per cent to 45 per cent, The West Australian reported.
On a two-party preferred basis the Liberal Party's support has dropped from 53.6 per cent to 51 per cent.
It was a similar result for Liberal MP Steve Irons who is being challenged by Labor's Hannah Beazley, daughter of former leader Kim Beazley.
Primary support for Labor's Anne Aly, who holds Cowan by just 0.7 per cent, is holding, while here Liberal opponent Isaac Stewart is under hte 2016 result.
The survey was conducted for Seven West Media by YouGov Galaxy on the evening of May 1, after both Prime Minister Scott Morrison and Opposition Leader Bill Shorten had campaigned in Perth and held a leaders' debate.
The results are based on the opinions of 506 voters in Cowan, 525 voters in Pearce and 504 voters in Swan.
