The WA Liberal Party's internal polling shows the state government is in a "far worse" position than that shown by published surveys, which point to a Coalition loss on Saturday, and the preference deal with One Nation is to blame.
A source who has seen polling conducted for the WA Liberal Party one week ago said the government was facing a two-party preferred position of 57-43.
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Doing her bit to drum up support, Pauline Hanson is doing the rounds in WA ahead of Saturday's election, but there'll be some notable absentees. Courtesy ABC News 24.
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Hanson campaigning in WA
Doing her bit to drum up support, Pauline Hanson is doing the rounds in WA ahead of Saturday's election, but there'll be some notable absentees. Courtesy ABC News 24.
This could lead to the Liberal-Nationals Coalition haemorrhaging as many as 20 seats.
The party has already given up hope in several seats including the marginals of Forrestfield, held by Nathan Morton, and Perth, held by Eleni Evangel. But a source familiar with internal tactics said the party was also not expecting to hold the seats of Joondalup, which is held by Jan Norberger with a 10 per cent margin, Jandakot and Kalamunda, currently held by Health Minister John Day with a similar margin.
The party believes Labor could also pick up the seats of Southern River, Darling Range, Belmont, Mount Lawley, Bunbury, Bicton, Balcatta, Wanneroo, Burns Beach and Riverton -Â all currently held by the Liberals with double-digit margins.
The 57-43 position is far worse than Fairfax Media's ReachTel poll results published four days ago.  That survey put the LNP trailing Mark McGowan's Labor party 48-52.
A Galaxy poll published on the weekend in the Sunday Times newspaper had the government in a worse position of 46-54.
WA Liberal state director Andrew Cox did not respond to Fairfax Media's requests for comment. Last month Mr Cox approved a deal for the Liberals to preference One Nation above their National Party Coalition partners in the Upper House in country regions.
The Liberal source said the dismal forecast for this weekend's state election was the result of a major backlash to the Liberal Party's preference deal with One Nation.
"Liberals want to be able to say we're for stronger borders but we're not racists," the source said.
Hanson hits WA
One Nation Leader Pauline Hanson has kicked off a week's campaigning in Western Australia ahead of Saturday's vote.
But her campaign is being dogged by her position opposing vaccinations of children against deadly diseases and her praise of Russian President Vladimir Putin.
Senator Hanson told radio station 6PR that her stance is a personal opinion only and that she recommends parents speak to their doctor about vaccinating their children.
The medical profession has condemned Senator Hanson for opposing vaccinating children but she said she has had numerous parents tell her of their concerns with vaccinations.
Prime Minister Malcolm Turnbull has rebuked Senator Hanson on both issues.
Last month, the influential Cabinet Minister, Arthur Sinodinos defended the Liberal Party's decision to preference One Nation in Western Australia, describing the party as more "sophisticated" compared to 20 years ago.
Senator Sinodinos served as Chief of Staff to former prime minister John Howard, who declared that One Nation should always be preferenced last.
Mr Howard has since revised his view.
Labor has relentlessly attacked Mr Barnett for "doing a deal" with One Nation.
During a seven-minute interview on the ABC's 730 on Monday night, Mr McGowan referred to the deal or "alliance" between One Nation and the Liberal party six times.