The meeting under the DMK aegis is seen by political observers as a possible grand alliance to take on the BJP juggernaut in the 2019 Lok Sabha polls.
It was a virtual coming together of non-BJP parties on a common platform ahead of the Presidential elections.
Present on the dais at the sprawling YMCA grounds at Royapettah here were top non-NDA leaders, including Congress vice president Rahul Gandhi, Bihar Chief Minister Nitish Kumar, Puducherry Chief Minister V Narayanasamy, TMC leader Derek O'Brien, CPI(M) General Secretary Sitaram Yechury,former J&K Chief Minister Omar Abdullah and CPI national secretary D Raja.
However, Stalin has denied his father's birthday bash will serve as a platform for non-NDA parties to discuss the presidential polls.
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He had earlier said that Congress president Sonia Gandhi had already held discussions with him on the possibility of putting up a joint opposition candidate.
Karunanidhi was not present as he is still recovering from a surgical procedure.
The venue was packed to capacity with DMK cadres. Police had made tight security arrangements.
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