island where president mandela spent more than 20 years in prison. a former top military adviser to president obama is under investigation. retired u.s. general james cartwright is being questioned about leaking classified information to a reporter, it concerns a computer virus that targeted iran's nuclear facilities. barbara starr joins us with the details. can this be happening again? >> good morning, chris. even for the pentagon this is jaw-dropping. source tells me overnight that yes, general cartwright retired is under investigation by the justice department for material in the book by the "new york times" journalist david sanger his book "confront and conceal" talking in detail, many revelations about iran's nuclear program. nbc news reported this first, saying this is about the leak, did general cartwright leak information about stux inenetst of the most classified crowned