Watch: PM Modi Very Impressive, Visa Controversy in the Past - Top US Official to NDTV

US Deputy Secretary of State William Burns speaks to NDTV in an exclusive interview after meeting Prime Minister Narendra Modi - the first official contact between the Obama administration and the Modi government. In the interview, he described Mr Modi as a "very impressive man". Speaking about a report that America's National Security Agency was authorized to snoop on the BJP, he said he understands India's concerns on the controversy but added that he was "not at liberty to say more in public". (Read full transcript here)