A furious Pauline Hanson will wreak havoc with preferences to hurt Scott Morrison's chances of retaining government, declaring he had "handed the keys to The Lodge" to Bill Shorten after the Prime Minister decreed the Liberal Party would preference Labor over One Nation.

Senator Hanson labelled Mr Morrison a "fool" while also unleashing on the media for "hate and bias" as she hit back at revelations key party officials had cosied up to pro-gun rights activists and a claim that she believed the 1996 Port Arthur massacre was a conspiracy.