Prime Minister Narendra Modi called up Panneerselvam and sought support, a statement from AIADMK (Puratchithalaivi Amma) said.
"Panneerselvam informed the prime minister that the AIADMK (Puratchithalaivi Amma) will support Naidu" in the August 5 election, it said.
The faction, which has 12 MPs, earlier supported NDA's Presidential nominee Ramnath Kovind.
The faction led by Chief Minister K Palaniswami also supported the NDA candidate for the President.
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