The Palmer United Party (PUP) is considering taking High Court action against Glenn Lazarus after the Senator quit its ranks.
Mr Lazarus resigned last week after his wife Tess Lazarus was fired by the PUP headquarters.
Mr Lazarus said he had a different view of team work to Mr Palmer, who accused him of “spitting the dummy”.
PUP’s Senate numbers have dwindled from a bloc of four to one, and national director Peter Burke said it would consider High Court action to recover Mr Lazarus’s seat.
“Clearly, voters put the Palmer United Party before Mr Lazarus, and we do not believe he holds the seat on his own merits,” Mr Burke said in a statement on Monday.
“Australians have had enough of politicians saying one thing before an election and then acting differently once voted in. We believe he has misled the party.”
PUP received more than 250,000 votes above the line in the last Federal Senate election and only 6,770 votes went below the line to Mr Lazarus, Mr Burke said.
Mr Burke said discussions were underway with the Democratic Labour Party, which is pursuing Senator John Madigan in the High Court following his resignation last year.