Metropolitan Magistrate (MM) Dheeraj Mittal issued the summons against Irani asking her to appear before it on September 27.
Nirupam, a former Congress MP, had filed the complaint against Irani alleging that on December 20, 2012, when assembly election results of Gujarat were announced, the BJP leader had made "defamatory and scurrilous comments" against him during a TV debate.
"That the accused (Irani), a Member of Parliament of the BJP defamed the complainant by making direct aspersions on the character of the complainant (Nirupam)," the complaint, filed through advocate R K Handoo, said.
Earlier, Irani had also filed the defamation complaint against Nirupam for allegedly defaming her during the same debate on the news channel and the court had framed charges against him for allegedly using derogatory and indecent language against her.
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Nirupam, in his complaint, alleged that Irani had also made derogatory comments against him intentionally and knowing fully well that these "utterances are defamatory against the complainant."
"The complainant is paying heavily in terms of loss to his reputation and political career apart from the mental agony and torture caused to the complainant for the scurrilous and defamatory comments and allegations made by the accused (Irani)," it claimed.