MDMK, along with DMK, had announced its decision to boycott the bypolls, even as BJP had set in motion its preparatory works to contest the elections by forming two panels to elicit views on aspiring candidates.
MDMK's decision to support its lead partner came after a two-member BJP delegation led by its state unit president Tamizhisai Sounderrajan held discussions with Vaiko, the party said in a release.
Vaiko assured his party's support on the basis of being a member of the BJP-led NDA alliance, which was forged for the April 24 Lok Sabha polls, it added.
