"Congressional sources familiar with limited aspects of the program would not discuss any classified details but made it clear there were serious questions about the legality of the NSA actions. The sources, who demanded anonymity, said there were conditions under which it would be possible to gather and retain information on Americans if the surveillance were part of an investigation into foreign intelligence.
But those cases are supposed to be minimized. The sources said the actual work of the NSA is so closely held that it is difficult to determine whether it is acting within the law.
The revelations come amid a fierce congressional debate over reauthorization of the USA Patriot Act, an anti-terrorism law passed after the Sept. 11, 2001, attacks. The Patriot Act granted the FBI new powers to conduct secret searches and surveillance in the United States.
Most of the powers covered under that law are overseen by a secret court that meets at Justice Department headquarters and must approve applications for wiretaps, searches and other operations. The NSA's operation is outside that court's purview, and according to the Times report, the Justice Department may have sought to limit how much that court was made aware of NSA activities."
---Washington Post
http://www.washingtonpost.com/wp-dyn/content/article/2005/12/16/AR2005121600021.html