One of the most bitter feuds in federal politics has taken a bizarre turn, with One Nation hiring a woman who falsely accused fellow crossbencher Derryn Hinch of rape.

Senator Hinch has expressed dismay Mary-Ann Martinek has been given a Parliament House pass after One Nation senator Brian Burston employed her as a research assistant.

"If I had my way I'd have security escort her out of this building," Senator Hinch said. "The fact One Nation has taken her on says a lot about them. The only use she would be to One Nation would be to attack me."

Senator Hinch alleges Ms Martinek was behind recent claims that he was a UK or US dual citizen.