The leader of the Samoa Party, Su'a Rimoni Ah Chong, has welcomed Prime Minister Tuilaepa Sailele's decision to take him to court.
Su'a and his deputy Le Tagaloa Pita, Sala Vaimili II and SDUP leaders Le Mamea Ropati, Asiata Saleimoa Va'ai and Tuia Pua Letoa have been named in the action.
The move stems from what Tuilaepa has described as deliberate misrepresentation of the truth and grossly defamatory statements against the government by the defendants.
The two parties say that the ruling Human Rights Protection Party signed an agreement in 1998 allowing the use of customary land for security mortgages with the World Bank and its agency, the International Development Association.
Su'a has told the Samoa Observer if Tuilaepa feels the law has been broken he should take them to court.