Islamabad- Federal Minister Khurram Dastgir Khan has said positive criticism on the government policies is part of democracy but it should not be only for sake of criticism. In an interview, he alleged that Pakistan Tehrik-e-Insaf chief Imran Khan is using abusive language against leaders of other political parties, which did not suit him. To a question, Khurram Dastgir termed PTI's demand of Prime Minister's resignation unconstitutional.