Constitutional Court Chief Justice Mahfud M.D. on Friday said the government should push Singapore to sign an extradition treaty by making the treaty a requirement for the bilateral relationship between the two countries to continue.

"From the time I joined House Commission I [overseeing defense and foreign and political affairs] until today, there has been no clear agenda [with Singapore]," said Mahfud, who was a member of House Commission I from 2008 until 2010, when he succeeded Jimly Asshiddiqie as chief justice of the Constitutional Court.

Mahfud said that Indonesia has the upper hand in the matter of pushing Singapore to sign an extradition treaty. He said that in terms of security and economy, Singapore is very dependent on Indonesia. But in the absence of an extradition treaty, Singapore has been reaping the benefits of ill-gotten money from Indonesia being spent in the country, Mahfud said.

Meanwhile, Johan Budi, a spokesman for the Corruption Eradication Commission (KPK), said that graft investigators have not scheduled any investigation into the dismissed treasurer of the Democratic Party, Muhammad Nazaruddin, who is now in Singapore.

"At present, investigators have not yet determined the investigation schedule for Nazaruddin, but it is definite that he will be investigated," Johan said.

Nazaruddin's connection to an unsolicited payment made to Janedjri M. Gaffar, secretary general of the Constitutional Court, as reported to the KPK by Mahfud, will also be investigated, Johan said.

In that case, the KPK has already taken statements from Mahfud, Janedjri and other members of staff at the Constitutional Court. KPK investigators have already visited the Constitutional Court in relation to the case, "But we are still at the stage of gathering information and evidence," Johan said.

Concerning the status of high-profile corruption suspect Nunun Nurbaeti, Johan said the KPK investigation teams flown to Singapore and Thailand to search for the fugitive have not been successful. Nunun, who allegedly distributed checks to lawmakers involved in a bribery case that led to the appointment of Miranda Gultom as senior deputy governor of the Central Bank in 2004, has been repeatedly summonsed by the KPK. "The investigation teams will return to Indonesia today, but without Nunun," Johan said.

Although Indonesia does not have an extradition treaty with Singapore, the KPK has in fact formed a memorandum of understanding with Singapore's Corrupt Practices Investigation Bureau. "While it is not an extradition treaty, it is still a government-to-government agreement," Johan said.