Kanimozhi, the daughter of the regional Dravida Munnetra Kazhagam (DMK) party's head and herself a lawmaker, was summoned to appear on May 6, along with Sarath Kumar of Kalaignar TV Channel, owned by the DMK, and Karim Morani of Cineyug.
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All three have been charged with handling bribes in a telecoms licensing scandal that a state auditor said may have deprived the government of Rs 1.76 lakh crore ($39 billion) in potential revenue. The scam resulted in the resignation and arrest of telecom minister Raja.
Months of corruption scandals have battered the Congress party-led government, stymied its agenda for economic reforms and fed a sense of regulatory uncertainty in the world's fastest growing mobile phone market.