Determined to keep the heat on Home Minister P Chidambaram in the backdrop of the adverse Finance Ministry note on 2G spectrum allocation, the BJP on Saturday upped the ante against him saying there was so much evidence against him now that he could share the same Tihar jail cell where former telecom minister A Raja has been lodged. “There is so much evidence that has come out against P Chidambaram in the 2G spectrum case that for CBI to say in court now that he is not guilty would be laughable. Chidambaram’s place is in the same cell in Tihar jail in which A Raja has been lodged,” senior leader Yashwant Sinha told reporters here.