“If this interpretation of AUMF were correct..."

“If this interpretation of AUMF were correct, moreover, parts of the Patriot Act would have been unnecessary.  Finally, given that FISA, the existing law, deals explicitly and specifically with intelligence gathering, while AUMF [Authorization to Use Military Force] says nothing at all about foreign intelligence, FISA would automatically trump AUMP as a matter of legal principle, even if the administration’s interpretation were correct.

The administration itself didn’t seem to take this argument seriously.  When asked why, if the administration considered FISA inadequate to its purposes, it had not sought to amend it, Attorney General Alberto Gonzales frankly testified that they didn’t think they would be able to win congressional approval for amendments to FISA.  So they proceeded with the program anyway.  [....] Why did they consider amending FISA in order to give themselves a power they supposedly already had?
....
What was the real reason for the program, then?  Who was targeted and why?  No answers to these questions have been forthcoming.  Bland assurances that our leaders are trustworthy and good, and would never abuse powers they have secretly exercised in defiance of the law, can hardly be taken seriously by those who believe in a free society.  Remember Jefferson’s cautionary words about confidence in men: we should be on our guard against our government officials, binding them down from mischief by the chains of the Constitution.  Government surveillance of individuals has been abused in the past, and it has targeted political opponents and the politically unpopular.  That’s why the safeguards that were flaunted here were established in the first place.” - Pages 112 & 113 of The Revolution, A Manifesto