The last decade has spawned a massive expansion of the domestic Surveillance State. Worse, the U.S. Government has vested itself with the virtually unchallenged ability to operate this surveillance regime in full secrecy and even beyond the reach of judicial review, which is another way of saying: above and beyond the rule of law.
Each time U.S. citizens in the post-9/11 era have accused government officials in federal court of violating the Constitution or otherwise acting illegally with how they spy on Americans, the Justice Department employs one of two secrecy weapons to convince courts they must not even rule on the legality of the domestic spying: (1) they insist the spying program is too secret to allow courts even to examine it (the Bush/Obama rendition of the "state secrets" privilege); and/or (2) because the spying is conducted in complete secrecy, nobody can say for certain that they have been subjected to it, and the DOJ thus argues that the particular individuals suing the Government -- and, for that matter, everyone else in the country -- lacks "standing" to challenge the legality of the spying (because nobody knows on whom we're spying, nobody has the right to sue us for breaking the law).
A government that can spy on its own citizens without judicial review is a government which, by definition, operates outside of the rule of law; as Alexander Hamilton put it in Federalist 15:
It is essential to the idea of a law, that it be attended with a sanction; or, in other words, a penalty or punishment for disobedience. If there be no penalty annexed to disobedience, the resolutions or commands which pretend to be laws will, in fact, amount to nothing more than advice or recommendation.