Lok Sabha and Rajya Sabha members of the AIADMK (Amma), including Lok Sabha Deputy Speaker M Thambidurai, accompanied Palaniswami on his visit to Naidu.
"We have unanimously decided to support Venkaiah Naidu, following a meeting of the senior members of the party," Palaniswami told reporters after his meeting with the former Union minister.
Their rival faction in the AIADMK, headed by O Panneerselvam, had met Naidu yesterday and extended its support to him.
He was in Delhi to attend the swearing-in ceremony of Ram Nath Kovind, the 14th President of India.