MDMK on Friday formally filed a petition before the Lok Sabha Secretariat seeking disqualification of two of its dissident MPs for defying party whip during the Tuesday's trust vote.
Party chief Vaiko had on Thursday expelled the rebel MPs from the MDMK.
Party leader C Krishnan filed the petition before the Lok Sabha Secretary General P D T Achary seeking disqualification of L Ganesan and Gingee N Ramachandran for going against the party whip and supporting the UPA government in the crucial trust vote.
When the party issued the direction to its MPs vote against the confidence motion, the voting of Ganesan and Ramachandran contrary to the direction of party attracted provisions of the Tenth Schedule and making them liable to be disqualified," Krishnan said.
The two dissident MPs had revolted against the party leadership for aligning with AIADMK in the 2006 assembly polls and functioned independently after they were removed from the party posts.
The rebel MPs had also approached the Election Commission to declare their group as the real party. But the EC had recently ruled that the party led by Vaiko was the real MDMK.