Mr. Muralitharan fills the vacancy created following the resignation of JVP's Wasantha Samarasinghe.
Meanwhile, JVP Propaganda Secretary Vijitha Herath says the party will go to court to challenge the appointment, which is a violation of the MoU signed for the formation of the UPFA.
Speaking to Lanka Dissent, he said clause 9 of the agreement gives five national list MP positions to the JVP.
Irrespective of whether the JVP remains a member of the UPFA or not, the party has the final say in the appointments to the five positions, Mr. Herath said.
Meanwhile, leader of the SLFP Mahajana Wing Mangala Samaraweera says it is unconstitutional to appoint persons who had not contested parliamentary polls or who are not in the national lists of political parties.
Mr. Samaraweerahas told Lanka Dissent news web that he would file a petition in the Supreme Court next week over this matter.
