The CBI has asked for the Lok Sabha Speaker's permission to prosecute Trinamool Congress MPs including Sougata Roy and Kakoli Ghosh Dastidar in connection with the Narada sting operation of 2016, in which many leaders are seen allegedly accepting bribes. CBI sources say the agency has written to Speaker Om Birla requesting sanction to act against Mr Roy, Ms Dastidar and Prasun Banerjee. Bengal Minister and former MP Subhendu Adhikari is also being investigated.