New South Wales Liberal MP Damien Tudehope has lost his promised seat in the Upper House despite a peace deal struck between the Premier, Gladys Berejiklian, and Treasurer Dominic Perrottet.
Mr Perrottet had agreed to move to the seat of Epping, currently held by Damien Tudehope, in a frontbench pre-selection stoush settled in September.
In exchange for the seat, Mr Tudehope agreed to take an Upper House position.
But the ABC understands Liberal MPs have voted against Mr Tudehope taking the spot, 60 to 58 on Friday night.
Mr Tudehope has declined to comment.
It is understood Mr Perrottet will still move into the seat of Epping.
Mr Perrottet had originally made a play for the blue-ribbon seat of Castle Hill, held by frontbench MP Ray Williams after Mr Williams refused to retire despite weeks of pressure from Liberal powerbrokers.
Mr Perrottet had held the seat of Castle Hill until he swapped to Mr Williams’s old seat of Hawkesbury, after a redistribution and factional deal in the lead-up to the last election.
But Mr Perrottet said the birth of two of his children since that time led him to want Castle Hill back.
The Liberal Party civil war hit a low when Mr Williams demanded Mr Perrottet quit cabinet and Ms Berejiklian was forced to step in and broker a peace deal.
It is unclear what Mr Tudehope will do now that deal has been scrapped.