The battle to drag the Victorian Liberal Party to the hard right has escalated amid rising panic that One Nation are "in for a serious shot at a few upper house seats" at the 2018 state election.

Confidential emails from senior figures on the Liberal Party's influential 19 member administrative committee warn that the party must undertake a "substantial and clear pivot back to the right" to win back voters being lost to One Nation.

Preselection candidate Stephanie Ross, Brighton Liberal James Newbury, and party numbers man Marcus Bastiaan. Credit:Twitter

And Fairfax Media has also obtained a private letter sent this week by pro-life campaigner Stephanie Ross, who is challenging 65-year-old incumbent Gary Blackwood for the state Liberal seat of Narracan, rallying supporters to "reignite the fire" to promote a socially conservative agenda and halt a push towards same-sex marriage and euthanasia.

"There is a state/nation wide push to bring conservative politics back into fashion!" the letter says. "People like Corey (sic) Bernardi in SA, Andrew Hastie in WA, George Christensen in QLD and Kevin Andrews in VIC are all fighting and need our backing."