A trail court here on Saturday dismissed a petition filled by Janata Party President Subramanian Swamy seeking to make Union Home Minister P Chidambaram a co-accused in the 2G spectrum scam case.

Special Judge OP Saini allowed only Swamy, his wife Roxanne, his private secretary and counsels into the court initially, but later allowed others to enter.

P Chidambaram	Subramanian Swamy

Swamy has alleged that Chidambaram was equally culpable like former telecom minister A Raja, as he also had a role in deciding the spectrum pricing and allowing telecom companies to off-load shares to foreign firms

The apex court on Thursday quashed 122 spectrum licences granted after January 2008, and asked a trial court to decide whether Chidambaram needs to be probed for his role in the spectrum case.

The apex court verdict was in response to Swamy's petition seeking a CBI probe into Chidambaram's alleged role in the spectrum scam, and on two pleas filed by noted lawyer Prashant Bhushan seeking cancellation of 2G licences and the setting up of a SIT to probe the scam.

Swamy had on January 7 submitted documents seeking prosecution of Chidambaram in the case before a Delhi court.

The telecom scam, one of India's biggest graft cases ever, may have cost 39.57 billion dollars in expected revenue losses to the public exchequer as per the Comptroller and Auditor General (CAG) of India's report.