Cricketer-turned-politician Gautam Gambhir, the BJP's East Delhi candidate, has said he will sue Delhi Chief Minister Arvind Kejriwal, his deputy Manish Sisodia and the Aam Aadmi Party's star candidate Atishi after her party on Thursday accused him of circulating offensive pamphlets on her. He has sent a defamation notice to the AAP trio demanding their apology.