"The agency has written to the Lok Sabha Speaker and are awaiting his permission to prosecute three sitting MPs," a CBI source told .
According to CBI sources related to the probe, the CBI has asked the permission to prosecute the leaders seen in the Narada sting video accepting cash.
He said that the agency is also investigating former Trinamool MP Subhendu Adhikari.
Just before the West Bengal Assembly elections in 2016, Mathew Samuel, Editor and Managing Director of Narada news portal, broadcast a sting video in which a number of Trinamool leaders were allegedly seen taking money on camera.
The CBI lodged an FIR in April 2017 following a court order, naming 13 Trinamool leaders and have interrogated many of them. The purported footage was also sent for forensic examination. The Enforcement Directorate is also probing the money trail in the case.
On Wednesday, the CBI grilled Trinamool MP K.D. Singh, Samuel and former TMC leader Mukul Roy in the case. Roy, after quitting the TMC had joined the BJP in November 2017. He was former aide of Mamata Banerjee, and had a fallout with her in 2015 when his name cropped up in the Saradha scam as well as the Narada sting operation.
( With inputs from IANS )