Lawyer D D Sharma filed the complaint in the court of Additional Chief Metropolitan Magistrate in Patiala House.
"The accused is in the habit of defaming and maligning top personalities of the country" and Bhushan should be prosecuted under section 500 (defamation) of Indian Penal Code, Sharma said in his complaint.
Bhushan was in the eye of a controversy for using a particular word against Singh.
However, he had claimed that what he said was that Singh's honesty was used as a shield by Congress.
