The Pivithuru Hela Urumaya (PHU) this week called for the Field Marshall Sarath Fonseka to be arrested "for withholding evidence in connection with the war crime charges levelled against former army commander (Rtd) General Jagath Jayasuriya, the Daily Mirror reported.
"Mr Fonseka betrayed the Army for the second time and therefore could be known as the biggest traitor in the world," the PHU leader Udaya Gammanpila told the paper.
“The first time he betrayed the army was the events related to the white flag case. He has tarnished the image of the country and the army by his statement."
"If Mr Fonseka admits that there were war crimes during his term, there was no need for further allegations to arrest him."
Last week Sri Lanka's ambassador to Brazil and former military general, Jagath Jayasuriya fled back to Sri Lanka after human rights groups filed lawsuits in Brazil, Chile and Peru over allegations of war crimes.
The incident has led to former senior military figures pointing the finger at each other as the person responsible for overseeing the military.