Senior Congress leader P Chidambaram is being questioned by the Enforcement Directorate at the probe agency's office in the capital after he was summoned in connection with the INX Media case. Last month, the Delhi High Court had given Mr Chidambaram protection from arrest till January 15. aThe central probe agency had earlier questioned Mr Chidambaram's son Karti in this case and has also attached his assets worth an estimated Rs. 54 crore, located in India and abroad.