Karti, meanwhile, sought bail from the trial court alleging that the CBI was acting at the behest of the Centre to malign the reputation of his father during whose tenure FIPB clearance was granted to the INX Media group.
Special CBI Judge Sunil Rana posted the bail plea for hearing on March 9 when the three-day CBI custody of Karti would come to an end.
The CBI got a shot in the arm when the CBI judge rejected Karti's stand that the case against him was "politically motivated" and "targeted" to tarnish the image of his father and allowed the agency to subject him to three more days of custodial interrogation.
The setback to Karti in the CBI case came few hours after the Supreme Court refused to grant him interim protection from arrest by the ED in a money laundering case relating to the INX Media group.
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It also asked the CBI to respond to Karti's allegations that he was being harassed by the roving probe of the two agencies.
Outside the trial court in Patiala House, Karti repeated his stand that the allegations against him were baseless.
While in the apex court, a bench of Chief Justice Dipak Misra and Justices A M Khanwilkar and D Y Chandrachud said that its order would not come in the way of proceedings being conducted before any other court, in the trial court, judge Rana said custodial interrogation of Karti was necessary to "speed up" and "maintain continuity" in the probe to secure evidence to arrive at the truth.
In the trial court, the ASG said there was a need for his further custodial interrogation as there were "new revelations" and Karti has to be confronted with "new facts".
He told the trial court that there was "substantial progress" in the last four days of probe and Karti "had not been cooperating" and had not disclosed passwords of his mobile phones.
The ASG said Karti was not entitled for bail as the investigation in the case was at a crucial stage and "during the course of investigation, names of a few more companies have surfaced yesterday only and for this purpose, further custody remand of the accused is required as he has to be confronted with the same".
Sibal told the apex court there was serious infringement of his client's fundamental rights due to the "arbitrary and malafide acts" of the ED, which is probing the alleged money laundering case and that Karti may be arrested by ED in a "frivolous" case lodged by it after his police custody granted by the trial court to the CBI gets over.
Karti was arrested on February 28 at Chennai Airport on his return from the United Kingdom, in connection with the FIR lodged on May 15 last year alleging irregularities in FIPB clearance to INX Media for receiving overseas funds worth about Rs 305 crore in 2007 when his father was finance minister.
The fresh evidence in the case, triggering the arrest, was based on a statement from Indrani Mukerjea, a prime accused in the Sheena Bora murder case and one of the then promoters of INX Media, alleging payment of bribe to Karti. The statement was recorded under section 164 of the CrPC before a magistrate on February 17.