PRESIDENT TRUMP’S NATIONAL security adviser, Gen. Michael Flynn, was forced to resign on Monday night as a result of getting caught lying about whether he discussed sanctions in a December telephone call with a Russian diplomat. The only reason the public learned about Flynn’s lie is because someone inside the U.S. government violated the criminal law by leaking the contents of Flynn’s intercepted communications.
In the spectrum of crimes involving the leaking of classified information, publicly revealing the contents of SIGINT — signals intelligence — is one of the most serious felonies. Journalists (and all other nongovernmental citizens) can be prosecuted under federal law for disclosing classified information only under the narrowest circumstances; reflecting how serious SIGINT is considered to be, one of those circumstances includes leaking the contents of intercepted communications, as defined this way by 18 § 798 of the U.S. Code:
Whoever knowingly and willfully communicates … or otherwise makes available to an unauthorized person, or publishes … any classified information … obtained by the processes of communication intelligence from the communications of any foreign government … shall be fined under this title or imprisoned not more than ten years, or both.