Supreme Court today issued notice to Delhi Chief Minister Arvind Kejriwal on a petition challenging a Delhi High Court order in a defamation case against him.The defamation case was based on a press conference in a May 15, 2013 in which Kejriwal, while alleging conflict of interest, had said that Amit Sibal had appeared in the Supreme Court for Vodafone while his father Kapil Sibal was...