Sri Lanka Freedom Party (SLFP) general secretary Duminda Dissanayake said that the party's central committee that met today chaired by Sirisena has decided to join a national government with Wickremesinghe's United National Party (UNP) for two years.
Party member Nimal Siripala de Silva said the SLFP will work with other political parties in the government to address key issues.
The 66-year-old incumbent premier , whose reform agenda was stalled due to Mahinda Rajapaksa's loyalists blocking some of his moves, now has teeth to get his way in enforcement of his plans after thwarting the former president's bid to stage a political comeback.
"Through this approach ... All parties could work together either in government holding a ministerial position or in Parliament through the oversight committees," he said.
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SLFP member A H M Fowzie said that a committee has been appointed under former president Chandrika Kumaratunga to work on a policy framework under which the party will work in the national government.
The committee, which includes de Silva, will also decide on the number of portfolios which need to be allocated to the SLFP in the government.
Wickremesinghe, whose oath-taking was supposed to take place today but got postponed till tomorrow after which his new Cabinet will be appointed, has said he will continue the mandate for good governance given in parliamentary polls, Colombo Gazette reported.
His party won 106 seats in Monday's parliamentary election, just 7 short of a simple majority in the 225-member assembly but enough to form a government.
The veteran reformist was handpicked by Sirisena to lead a minority government after the longtime president Rajapaksa was defeated in the January 8 elections.