Markus Junianto Sihaloho – A Democratic Party official on Monday said an investigation into a graft case allegedly involving some of its members was not the result of divisions between rival camps in the party.

The Corruption Eradication Commission (KPK) plans to summon Muhammad Nazaruddin, a Democratic lawmaker and the party's treasurer, to answer allegations he took Rp 25 billion ($2.9 million) in relation to a construction project for November's Southeast Asian Games in Palembang.

The case has raised speculation that a widening internal rift is ratcheting up tensions that could potentially split the party.

"I hope law enforcers will immediately investigate the case so it can be cleared up," said Melani Leimena Suharli, a Democrat and deputy speaker of the People's Consultative Assembly (MPR).

Melani denied speculation that the probe was the result of problems within the party that started after Anas Urbaningrum was appointed the party's chairman last year.

She said the party factions that had supported the three candidates for the chairmanship – including Andi Mallarangeng, the state minister for youth and sports affairs – were all now united behind Anas and the party's national leadership board.

In its most recent issue, Tempo magazine reported that some lawmakers from the House Commission X, which oversees youth and sports affairs, had allegedly received bribes linked to the building of an athletes' village ahead of the Games.

The article alleged that some of the commission members, including Democrat lawmaker Angelina Sondakh, had asked for gratuities from Duta Graha Indah, the construction company who won the bid for the project.

Both Nazaruddin and Angelina are supporters of Anas. Angelina, however, has not been sought for questioning by the KPK.

On Monday, the Democratic Party's faction in the House held an internal coordination meeting at Senayan. Melani said the meeting covered the bribery case among several other issues, but declined to elaborate.

Jafar Hafsah, the chairman of the faction, also said he would not be drawn on what was discussed at the meeting.

In a statement released to the media on Monday, Nazaruddin urged the KPK to resolve the case quickly so he could clear his name and that of the party.

Responding to speculation that the case was the result of a party dispute, Nazaruddin defended Andi, the sports minister.

"I am sure he's not taking revenge for his loss in the party's last congress. We are still unified as a party," he said, adding that he was certain Andi was not behind the push to investigate the case.

Nazaruddin said he had nothing to hide and would cooperate fully with investigators. "I hope the KPK can be fair and base the case on legal evidence," he said in the statement.

According to the lawyer who formerly represented Mindo Rosaline Manullang, the suspected broker linked to the case, Nazaruddin received Rp 25 billion in kickbacks from the project.

Kamaruddin Simanjuntak, who has since been fired by Rosaline, said she once told him that Nazaruddin, who was her boss at a little-known company called Anak Negeri, had received a commission equal to 13 percent of the total value of the SEA Games construction project.

Another 2 percent, or roughly Rp 3.82 billion, was allegedly set aside for the secretary general of the Youth and Sports Ministry, Wafid Muharram, who was detained last month by the KPK in relation to the case.

Rosaline's new lawyer, Djufri Taufik, however, has dismissed Kamaruddin's assertions as false.