Janata Party leader Subramaniam Swamy on Wednesday moved a city court to make former communications minister A Raja the prime accused in the 2G allocation scam.
"I have filed a private criminal complaint in Tis Hazari court for making Raja the prime accused," Swamy told reporters in New Delhi.
Swamy had filed a public interest litigation in the Supreme Court seeking permission for criminal prosecution against the minister.
Swamy said he received a letter from the CBI on Tuesday saying they have registered complaints against unknown people in the 2G spectrum scam while investigations are still on against Raja.
"They have not included Raja's name in the FIR and I hope today (Wednesday) when I go to the court they will formally make him an accused," he said.
The CBI on Wednesday raided the homes and offices of business lobbyist Niira Radia, former telecom regulatory chief Pradeep Baijal and relatives of Raja in connection with the case.
A prominent DMK leader, Raja was forced to exit from Prime Minister Manmohan Singh's government last month over charges that he sold second generation spectrum at below market rates, causing huge losses to the exchequer.
The controversy hit the roof following the leak of a large number of Radia's telephonic intercepts that showed her lobbying for Raja while talking to industrialists and journalists when Manmohan Singh was preparing to form a Congress-led government in May last year.