Seeking India's intervention in the matter, DMK President M Karunanidhi said Sirisena had in a recent meeting of the Sri Lanka Freedom Party (SLFP) 'categorically' stated that "there will be no place" for the concept of Federation in the new Constitution that seeks to replace the one adopted in 1978 by the island republic.
"If the doors of Federation are not opened and rights not devolved, how can Tamils live with dignity, relief and equality. Sirisena's announcement that there will be no possibility for federation amounts to rubbing salt to injury," he said in a statement.
Karunanidhi said that while the demands must be heeded, the new Constitution should also have provisions for equal treatment of Tamils.
The new Constitution should not act as a "balm" for them but should be like one being treated in the "intensive care unit," and the "heritage community" should be given its due respect and recognition which alone would solve the "complex" problems of Sri Lanka, he said.
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MDMK founder Vaiko criticised Sirisena's reported statement and said this would result in Tamils lacking equality.
He reiterated his demand for conducting a referendum on the creation of Tamil 'Eelam,' a seperate homeland for the ethnic minority as the only solution.
Meanwhile, TMC leader and former Union Minister GK Vasan also sought for India's role in ensuring equal rights for Tamils.
He said India should take up the matter with Colombo during the ongoing two-day visit of External Affairs Minister Sushma Swaraj to Sri Lanka.