With this development, 11 MLAs, including former Chief Minister O Panneerselvam himself are expected to vote against the motion.
"I am constrained to vote against the motion of confidence to be moved by the Edappadi K Palaniswami government," Nataraj said.
"I have interacted with people in my constituency and their considered and overwhelming opinion is that the government of O Panneerselvam should continue and I have to reflect this opinion of the people in the Assembly," he told PTI.
On his view on recent developments in ruling AIADMK, he said, "This is an unfortunate development. I do not belong to any camp. I have been working for unity in the party."
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"In the best interest of the party," Nataraj said he has been working towards ensuring that there was "no division in AIADMK and this is what Amma would have expected us to do."
He said he would continue to strive for bringing unity in the party and added that "still there is scope" for it.