Now we turn to the question, who is leaking the nation's top secrets? Surprising news of another investigation in washington. This time the name in the news is a top ranking former general. Abc's senior justice correspondent pierre thomas on the story that stunned a lot of people. &#9834; james "hoss" cartwright. Marine, fighter pilot, four-star general. Do what is right. Reporter: Until 2011, the number ranking officer at the pentagon. You are a great patriot, but more importantly, you are a damn good marine. Reporter: But now that storied military career and cartwright's reputation could be in jeopardy as he finds himself as perhaps the highest profile target in recent memory -- suspected of leaking some of the nation's most sensitive secrets. Did cartwright disclose a secret -- the details of a covert cyber attack against iran's nuclear program where the u.S. And israel unleashed a virus on iran's computer to slow down their quest for a nuclear bomb. The secrets were revealed in a 2012 book, leaving congress outraged and the obama administration vowing to find the leaker. If we can root out folks who have leaked, they will suffer consequences. Reporter: Cartwright say consultant for abc news. Tonight his attorney released a statement saying cartwright is an american hero and that any suggestion that he could have betrayed the country he loves is proposterous. Pierre thomas, abc news, washington.