Rod Culleton says Pauline Hanson's One Nation is being swallowed up by the Liberal Party thanks to the work of her chief of staff James Ashby.
The former One Nation senator, who quit the party before being ejected from the Senate in January, says Mr Ashby is the party's real leader.
Under his leadership, One Nation is allowing the Liberals to "put its tentacles over it and shove its DNA into it and become part of the Liberal Party".
"That's why I got out," he told AAP on Thursday.
"I call him the party leader."
Several dumped One Nation candidates have claimed Senator Hanson is a puppet under the control of Mr Ashby.
Shan Ju Lin, who was disendorsed after a series of anti-LGBTI posts on social media, has urged Senator Hanson to sack Mr Ashby because he is exerting a dangerous level of control and poses a threat to One Nation's grassroots support.
Those comments were echoed by ex-candidate Peter Rogers, who was dumped over an online post alleging the Port Arthur massacre and the drowning of a Syrian toddler were fabrications.
Senator Hanson has been contacted for comment but has previously defended Mr Ashby as a trusted advisor, insisting no one should be in any doubt about who is in charge.
Mr Culleton was stripped of his West Australian Senate seat in December after the Federal Court declared him bankrupt, a decision he is appealing.
Meanwhile, the High Court sitting as the Court of Disputed Returns will on Friday hand down its judgment on whether he was eligible to have been elected in the first place, given he had been convicted of larceny at the time of the July 2 election.
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