"We want to accommodate everybody in the process. We will welcome ideas through social media. We will be the first country to formulate a constitution through ideas to be made through social media," prime minister Ranil Wickremsinghe said.
The Lankan government on January 9, moved a resolution in a special session of the Parliament to convert the whole Parliament into a Constitutional Assembly.
"They are free to make amendments. We will consider all opinion. This is only the mechanism to make the constitution," Wickremesinghe said.
He said his party would not propose any, but all other political parties big or small are free to make proposals.
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"We have all taken oath under the sixth amendment to oppose separation of the country. So we will not do anything against it," he said.
Sirisena, who was elected last year after his stunning electoral victory over Mahinda Rajapaka, wants to abolish the present executive presidential system which for long has faced accusations of being authoritarian.
Sri Lankan troops in 2009 defeated the LTTE which was fighting for an independent state for minority ethnic Tamils.
At least 40,000 Tamil civilians may have been killed in just the final months of the civil war, according to a UN report.
The Sri Lankan government has promised that it will investigate alleged war crime allegations against government troops and Tamil Tiger rebels.