Vaithilingam, representing Kamaraj Nagar Assembly segment,and Subramanian told PTI that they made their announcements to senior Congress leader, V Narayanasamy at the PCC office here.
However, Vaithilingam continues to be MLA.
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They said that they would soon send their letters to the party high command.
Narayanasamy, the party nominee, was trounced by the ruling AINRC candidate R Radhakrishnan in the Lok Sabha polls by a margin of more than 60,000 votes.