I did some more digging:
In Re: Sealed Case, the 2002 opinion by the special panel of appellate judges established to hear FISA appeals. In its per curiam opinion, the court noted that in a previous FISA case (U.S. v. Truong), a federal "court, as did all the other courts to have decided the issue [our emphasis], held that the President did have inherent authority to conduct warrantless searches to obtain foreign intelligence information." And further that "we take for granted that the President does have that authority and, assuming that is so, FISA could not encroach on the President's constitutional power."
The FISA process was designed for wiretaps on suspected foreign agents operating in this country during the Cold War. In that context, we had the luxury of time to go to the FISA court for a warrant to spy on, say, the economic counselor at the Soviet embassy.
The evidence is also clear and weighty that the Administration was careful in limiting the FISA exceptions. They applied only to calls involving al Qaeda suspects or those with terrorist ties. Far from being "secret," key Members of Congress were informed about them at least 12 times, President Bush said yesterday. The two district court judges who have presided over the FISA court since 9/11 also knew about them.
Therefore, once again, not illegal. However, the leakers did something illegal, and the members of the 535 debating club are doing something damn unpatriotic and unscrupulous by attempting to usurp Presidential authority.
