Discarded Liberal MP Dennis Jensen has announced he will contest the West Australian seat of Tangney as an independent candidate at the federal election.

Dr Jensen was cast aside by Liberal preselectors last month, losing a ballot to the party's former state director Ben Morton by an overwhelming 57 votes to seven.

He has since lashed out at the party, accusing his rivals of branch stacking and of leaking extracts of his book Sky Warriors in order to damage his preselection bid.

The book contained a graphic sex scene, which the MP said caused his support among Christian Liberals to crumble.

Dr Jensen called a media conference in Perth on Monday to announce his decision to run as an independent.

He said if he was elected, he would put constituents first, not a party.

"I am making a stand against the faceless men and women in the Liberal Party who pervert the process and Liberal ideals," Dr Jensen said.

"In my view branch stackers should be jailed and the AEC should be part of the preselection process."

He also said he would not be resigning from the Liberal Party.

"My values remain very much Liberal values. It's up to the Liberal Party what they want to do," Dr Jensen said.

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However the State Director of the Liberal Party, Andrew Cox, confirmed Mr Jensen had been expelled from the party after declaring his run as an independent.

Mr Cox said Mr Jensen had cancelled his own membership by breaching party rules, in accordance with its constitution.

"A Member shall cease to be a Member of the Party if the Member without the consent of the State Council stands for election to any Parliament in opposition to any candidate endorsed by the Party," Liberal Party rules state.

Jensen not a 'difficult distraction': Keenan

The Liberal member for Stirling, Michael Keenan, downplayed the significance of Dr Jensen's candidacy.

"I don't think it will be a particularly difficult distraction. We've got a very good candidate there with Ben Morton," Mr Keenan said.

"It's obviously a very difficult situation when you lose preselection, it's a very bruising experience for anyone, but we've made a decision about that.

Ben Morton says he can do a better job for the people of Tangney. ( ABC News: Rebecca Carmody )

"Dennis is entitled to run like everyone else."

Mr Morton said he was confident he could do a better job representing the people of Tangney.

"[But that] doesn't mean that we can't also thank and respect Dennis for his contribution as the member for Tangney for 12 years," he said.

Tangney is one of the Liberal Party's safest seats in WA, held by a margin of 13 per cent after last year's electoral redistribution.

Dr Jensen has represented the electorate in Federal Parliament since 2004.

He said last month negative media coverage of his book played a big part in costing him preselection.

Dr Jensen also said he was "the most popular member for Tangney there's ever been".