Then admitting and disclosing the classified program opens the door to prosecution, yes?
If the program's existence was classified, YES.
No, if you try to prosecute him, he is entitled to a defense. Then his defense attorney is going to try to subpoena everything that is involved, have people testify about his job and what he did. Just can't do that. Now that doesn't mean that there are no repercussions against people who leak, there are, plus once you're in the Intel community, that is really your career for life and you don't want to risk that. Most people who leave Intel work can't even put it on their resume, and their employer, in most cases, will not even confirm or deny you ever worked for them.