An inside view of the Flynn leak
Today's news is that Flynn, the subject of this unmasking, is willing to testify before Congress in return for immunity. I don't know if he needs immunity, but if the FBI is investigating him as has been reported, it would certainly be in his interests to secure it.
Notably, though, it doesn't matter if Flynn is guilty of a crime for the larger public policy debate on whether Trump's communications with his campaign and his transition team were being monitored by the Obama administration and improperly unmasked and leaked to reporters. Even if Flynn is guilty as sin (forgive me the wordplay) it was still a felony to leak his name to reporters, along with any of the rest of the transition team's identities and communications.
Remember that when you hear calls from the left that whatever Flynn supposedly did wrong vindicates any spying or leaking. It doesn't.