On Thursday, the Central Bureau of Investigation (CBI) has written a letter to Lok Sabha Speaker Om Birla seeking his permission in order to prosecute three of the Trinamool Congress party's sitting MPs and one former MP in the Narada sting operation case.

In more trouble for the #WestBengal's ruling #TrinamoolCongress, the #CBI has written to #LokSabha Speaker #OmBirla for permission to prosecute three of the party's sitting MPs and one former MP in the #Naradasting operation case.

Photo: IANS pic.twitter.com/x3j60CQmeZ