In this post, I aim to explore more in depth whether Bush had the legal power to authorize warrantless NSA surveillance. As I was putting the finishing touches on this post, I noticed that Orin Kerr beat me to the punch, and I find that we’ve identified the same issues and are in substantial agreement. His post is a lot longer and more detailed than mine (which is quite long itself), so read mine for a broader overview and Orin’s for the treatise-length account.
1. Fourth Amendment
The Fourth Amendment standards are somewhat vague. The Supreme Court declared in United States v. United States District Court, 407 U.S. 297 (1972) (often called the Keith case) that the Fourth Amendment required a warrant for the government to engage in electronic surveillance for domestic criminal investigations. However, the Court noted:
. . . [D]omestic security surveillance may involve different policy and practical considerations from the surveillance of “ordinary crime.” The gathering of security intelligence is often long range and involves the interrelation of various sources and types of information. . . . Often, too, the emphasis of domestic intelligence gathering is on the prevention of unlawful activity or the enhancement of the Government’s preparedness for some possible future crisis or emergency. Thus, the focus of domestic surveillance may be less precise than that directed against more conventional types of crime. . . . .
Different standards [for gathering domestic security intelligence] may be compatible with the Fourth Amendment if they are reasonable both in relation to the legitimate need of Government for intelligence information and the protected rights of our citizens. For the warrant application may vary according to the governmental interest to be enforced and the nature of citizen rights deserving protection.