BY A STAFF REPORTER After joining TMC from BJP, Mukul Roy has filed his nomination as the chairman of the powerful Public Accounts Committee in the state legislative assembly. Traditionally, the post has always gone to the Opposition claiming the BJP, but TMC mentioned that it is the prerogative of the Speaker. BJP cried foul mentioning that Roy had won on a BJP ticket and defected to TMC and hence he should resign and get elected as a ruling party candidate.