The move comes after CBI was snubbed by the Supreme Court for seeking custody of Maran for investigation.
The apex court had on Friday directed the former minister to appear before the agency from 11 AM to 5 PM for six days beginning today for answering its queries.
Maran reached the agency headquarters in the morning and was examined for nearly six hours before leaving the building at quarter past five.
The then Chief General Manager of BSNL has claimed that the telephone exchange was set up on the oral order of the then minister, Attorney General Mukul Rohatgi told the SC.
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Madras High Court had on August 10 cancelled Maran's interim anticipatory bail and directed him to surrender before CBI in three days, holding that "prima facie" Maran had "misused" his office by obtaining phone connections illegally and the charges against him were backed by material.
"We will not grant you (CBI) his custody. Interim order (of protection against arrest) to continue. In the meantime, we direct the petitioner to appear before CBI...," the apex court said, admitting the plea of Maran for final hearing.
It asked Attorney General Mukul Rohatgi, appearing for CBI, to prepare a questionnaire and give them to CBI personnel and the accused and further granted liberty to the agency to move before it, if Maran does not cooperate and answer the queries.