`Main Atal Hoon` trailer launch: Actor Pankaj Tripathi launched the trailer of his upcoming film `Main Atal Hoon` on December 20, which revolves around the life of former Prime Minister Atal Bihari Vajpayee. During the trailer launch, he opened up about his interest in politics and how he prepared for Atal Bihari Vajpayee`s biopic. Pankaj Tripathi also revealed why was he jailed for a week. Watch the full vidoe for more!