A city court in Kolkata on Wednesday  issued summons to BJP president Amit Shah directing him to appear on September 28 in connection with a defamation case filed by Abhishek Banerjee, Trinamool Youth Congress chief and nephew of West Bengal Chief Minister Mamata Banerjee.Abhishek Banerjee filed the criminal defamation case before the Metropolitan Magistrate, 8th of Bankshall court here...