On 10 May 2021, the newly elected AIADMK MLAs convened to choose the new Leader of the Opposition, an important post equivalent to a cabinet minister. The meeting was inconclusive, with both Panneerselvam and Palaniswami staking claims to the post, while their supporters hurled charges against each other. This included a prolonged quarrel between the two sections of the party outside the party's head office, causing unrest. Supporters of Palaniswami believed that he should be the Leader of the Opposition due to the party's good performance in the election in western Tamil Nadu, the region he hails from; whereas, Panneerselvam's supporters felt that the party fared poorly in other regions of the state due to Palaniswami's wrong policies during his Chief Ministerial tenure. Eventually, Palaniswami was elected as the Leader of the Opposition.
