In a joint press conference with the leader of the opposition in Delhi assembly Ramveer Singh Bidhuri, Tiwari said that if needed, BJP will also approach the court in the matter.
During the election campaign in 2014, Modi emerged as a leader who publicly took pride in his identity as a Hindu and promoted unapologetic nationalism.
The BJP, however, rejected the TMC's criticism of the Narendra Modi government on its ninth anniversary as an "effort to divert attention from its failures."
The investigations are underway in connection with the other accused. Sadaqat was arrested by a team of Special Task Force from Gorakhpur on February 27.