Husam who is also a member of PAS central committee has invited all Malaysians to join him in the suit.

"Everyone, including members of parliament, lawyers, NGOs and individual members of the public including from Sabah and Sarawak is invited to join me in filing this suit in the court," said Husam in a statement today.

He also said those interested may get in touch with him or his assistant at emailgadailautmalaysia@gmail.com .

The controversy erupted following a report by The Edge Financial Daily on April 22 that the Malaysian government had given away two disputed oil-rich blocks off Sarawak's Limbang, incurring a loss of more than RM320 billion in oil earnings.

Former prime minister Dr Mahathir Mohamad, who is also the advisor for national oil firm Petronas, had accused his successor Abdullah Ahmad Badawi of surrendering these rights for the exchange of Limbang, and called for all documents related to the deal to be made public.

Husam also said he would be writing to all state legislative members in Sarawak and Sabah to call for a special state assembly session to debate the issue.

Saying sovereignty of a nation was of paramount importance, he described the revelation that the two blocks were signed away to Brunei as shocking.

"Such action goes against the Constitution," he stressed, adding that Article 2 of the Constitution clearly states that any alteration of the country's border must first get parliamentary consent.

Husam also urged prime minister Najib Razak to reveal all details of cabinet meetings about the decision, as well as communications involving Putrajaya, Brunei, Sabah, Sarawak and Petronas.

A royal commission of inquiry must be established to investigate the unilateral decision of giving away the country's territory., failing which, the citizen civil suit would proceed, he added.