Chidambaram and his son were named in the chargesheet filed by the Central Bureau of Investigation in the case on July 19.
The agency filed a supplementary charge sheet before the special judge, who will consider it on next date.
The CBI is probing how Chidambaram, who was the Union finance minister in 2006, granted a Foreign Investment Promotion Board (FIPB) approval to a foreign firm, when only the Cabinet Committee on Economic Affairs (CCEA) was empowered to do it.
The senior Congress leader's role has come under the scanner of investigating agencies in the Rs 35-bn Aircel-Maxis deal and the INX Media case involving Rs 3.05 bn.
In its charge sheet filed earlier in the case against former telecom minister Dayanidhi Maran, his brother Kalanithi Maran and others, the agency had alleged that Chidambaram had granted an FIPB approval in March, 2006 to Mauritius-based Global Communication Services Holdings Ltd, a subsidiary of Maxis.
The Maran brothers and the other accused named in the CBI chargesheet were discharged by the special court, which had said the agency had failed to produce any material against them to proceed with the trial.
The Enforcement Directorate is also probing a separate money-laundering case in the Aircel-Maxis matter, in which Chidambaram and Karti have been questioned by the agency.
Both Chidambaram and Karti have denied the allegations levelled against them by the CBI and the ED.
Business Standard has always strived hard to provide up-to-date information and commentary on developments that are of interest to you and have wider political and economic implications for the country and the world. Your encouragement and constant feedback on how to improve our offering have only made our resolve and commitment to these ideals stronger. Even during these difficult times arising out of Covid-19, we continue to remain committed to keeping you informed and updated with credible news, authoritative views and incisive commentary on topical issues of relevance.
We, however, have a request.
As we battle the economic impact of the pandemic, we need your support even more, so that we can continue to offer you more quality content. Our subscription model has seen an encouraging response from many of you, who have subscribed to our online content. More subscription to our online content can only help us achieve the goals of offering you even better and more relevant content. We believe in free, fair and credible journalism. Your support through more subscriptions can help us practise the journalism to which we are committed.
Support quality journalism and subscribe to Business Standard.