Without having read it in depth, I believe American citizens outside US might be considered free game but there MUST be some limits, but inside the US I believe that is the purview of the FBI, with our current rights to trial by jury, search/seizure intact.
This is the result of U.S. Citizens who are traitors to our country (Adam Gadan as example, self-acknowledged Al-Queda member)
The problem is, our self-acknowledged enemies use our very laws and freedoms against us. I too fear the far-reaching hand of Big Brother (but I fear the Progressive hand much, much more than the Conservative Hand - and BOTH are equally capable of doing it).
However, if you are NOT an American Citizen (illegal alien, gitmo bay terrorist, ect.) I do NOT believe you are entitled to the same rights under American law as an American citizen. Which is also why it's important WHO/HOW we grant citizenship in the first place.
Absolute power corrupts absolutely.