The holding of elections after dissolution of parliament on the 20th would result in the next general election being held under the proportional representation (PR) system.
Sirisena during the Presidential election campaign promised to change the current electoral system.
A senior SLFP member said the current government did not have the ethical or moral right to hold elections under the PR system after promising electoral reforms.
However, Prime Minister Ranil Wickremesinghe and JVP Leader Anura Kumara Dissanayake have continuously called for the holding of the next election under the PR system.