One Nation leader Pauline Hanson has distanced herself from a potential party candidate, after he was involved in a scuffle with rogue West Australian senator Rod Culleton, as the party seeks to establish itself ahead of the upcoming state election.

Senator Culleton said he was recovering from an "unexpected attack" outside a Perth courthouse on Tuesday, after falling during a confrontation with Anthony Fels, a former WA parliamentarian and One Nation hopeful.

Mr Fels had attempted to serve Senator Culleton with court papers, as part of an ongoing financial dispute between the Senator and his former business partners.

Senator Culleton took to Twitter to release a statement alleging he had been assaulted outside the court, with "no warning" before he was "ambushed and knocked to the ground from behind", adding he had "growing concerns" for his family safety.