In a setback for Congress leader P Chidambaram, the Supreme Court on Monday refused to entertain his petition challenging the dismissal of anticipatory bail in a corruption case lodged by the CBI in the INX media scam. At the outset, a bench comprising justices R Banumathi and A S Bopanna said since Chidambaram has already been arrested and is in the custody of the CBI, his appeal in the case has become infructuous.