Informative links:

“NSA surveillance may be legal — but it’s unconstitutional” by Laura K Donohue, Georgetown law professor and director of the Center on National Security and the Law, in the June 21, 2013, Washington Post. NSA surveillance programs undermine purpose of FISA, which was established to prevent this kind of overreach

“The top secret rules that allow NSA to use US data without a warrant”  by Glenn Greenwald and James Ball in the June 20, 2013, London Guardian. FISA court submissions show broad scope of procedures governing NSA’s surveillance of Americans’ communication; documents show that discretion as to who is actually targeted lies directly with the NSA analysts.