The Enforcement Directorate had filed a case against Karti Chidambaram in May last year alleging irregularities in the grant of Foreign Investment Promotion Board (FIPB) clearance to INX Media for receiving foreign investment of over Rs. 300 crore in 2007 when P Chidambaram was the union finance minister.
Based on information about alleged illegal payments made by INX media, the CBI filed a separate case against Mr Chidambaram and others
The CBI had also carried out searches at the houses and offices of Mr Chidambaram across four cities for allegedly receiving money from the media firm owned by Peter and Indrani Mukerjea to scuttle a tax probe.
The Chidambarams, however, have denied all the charges made against them.