The CBI has claimed in the Supreme Court that it has more material to substantiate its charges against Karti Chidambaram, son of former Union Minister P Chidambaram, in a graft case. A bench of the apex court was hearing a case filed by the CBI challenging the Madras High Court order staying government's look out circular against Karti.<br/><br/>During the hearing before the bench headed by Chief Justice Dipak Misra, the CBI said it was ready with a sealed envelope containing the documents to buttress its probe done so far. However, advocate Kapil Sibal, representing Karti, said that the bench, also comprising Justices A M Khanwilkar and D Y Chandrachud, should not take on record the documents without the agency filing an affidavit in this regard. The bench will now hear the case on Friday.'<br/><br/>The FIR in the matter against Karti was lodged by the CBI on 15th May saying that there were irregularities in Foreign Investment Promotion Board clearance to INX Media for receiving overseas funds to the tune of 305 crore rupees in 2007 when his father was the Finance Minister.