MDMK chief Vaiko was detained on Monday for defying prohibitory orders after he held a demonstration here against the visit of Sri Lankan President Mahinda Rajapaksa for Narendra Modi's swearing-in ceremony.
Addressing his supporters at Jantar Mantar, Vaiko, whose MDMK is part of the NDA, said the presence of Rajapaksa would "pollute the sanctity" of Modi's swearing-in ceremony.
He also alleged that the Lankan President has committed genocide against the Tamils in the island nation.
Vaiko leads protest against Rajapaksa's arrival
However, Vaiko said that he was not against the NDA Government and greeted Modi, who is set to sworn in as Prime Minister on Monday.
Vaiko was later taken into custody for defying prohibitory orders.
The MDMK chief is opposed to the invitation extended to the Sri Lankan President and had asked the prime minister-designate as well as BJP President Rajnath Singh to reconsider the decision.
Vaiko had earlier written a letter to Modi expressing his sadness over the invitation being extended to Rajapaksa for the event.
Recalling that no Sri Lankan Head of State was invited when Atal Bihari Vajpayee was sworn in as Prime Minister, Vaiko had pointed out that even Manmohan Singh had not invited the Sri Lankan President for his swearing-in ceremony.
"They did not dare to invite Mahinda Rajapaksa to the swearing-in ceremony in 2004 and 2009," he had said.
Tamil Nadu Chief Minister J Jayalalithaa and DMK President M Karunanidhi have also opposed the invite to Rajapaksa.
The Sri Lankan President arrived early morning on Monday for the ceremony.