The Paraka Lawyers firm has been at the centre of a series of court cases regarding alleged fraudulent state payments.
The lawyer says the probe and the publicity around the fraud allegations have destroyed his reputation and caused significant loss of business for his firm.
Paraka is seeking hundreds of millions of dollars in damages from the state, its agents and those individuals involved in the probe.
Defendants in his claim include a number of MPs, Prime Minister Peter O’Neill and Foreign Minister Rimbink Pato, members of Task Force Sweep and district court judges.
“Those individuals who screwed me up, they’re going to pay me big compensation for destroying the biggest law firm in this country,” Paraka told a press conference in Port Moresby.