The FISA Court initially denied the tap. Only after the warrant was narrowed did they allow it. The issue here is once they allowed it how far was it expanded beyond the scope of the narrowed warrant? In either case the tapping of political opponents is illegal but this should not surprise anyone considering the history of this admin and targeting political opponents such as the Tea Party. Obummer plays by Chicago rules and a few officials are sitting in jail right now playing those rules.
How is the wiretap illegal if allowed by the FISA court?