The Tamil National Alliance's M A Sumanthiran was addressing the House when it met as the Constitutional Assembly started discussions on the interim report of the all-party steering committee in order to formulate a new Constitution to replace the existing 1978 charter.
"This is a historic moment that Tamil party representatives have agreed to the proposals made in the interim report. Let all join and support this," he said.
The three-day debate is aimed at discussing the interim report against which majority Buddhist religious leaders have already expressed opposition.
Sumanthiran said the Tamils want the final solution to be a federal one, adding that the founder of the Sri Lanka Freedom Party (SLFP) S W R D Bandaranaike in 1926 had stated that federalism was the best solution.
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The SLFP, currently led by President Maithripala Sirisena, forms part of Sri Lanka's ruling alliance.
"Treat us (Tamils) as equals, we are Sri Lankan," Sumanthiran said adding that "to erase the bitter past there must be dignity, equality of all in the country".
The joint opposition backers of former president Mahinda Rajapaksa said they would reject the report's contents as it endangered the sovereignty and territorial integrity of the country.
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