Doesn't mean that they aren't watching...
According to the standard narrative, the history of American intelligence cleaves neatly into two acts: the free-for-all years that preceded the Church Committee, and the responsible years that have followed.
But even as enshrined in the Foreign Intelligence Surveillance Act of 1978, the prohibition on domestic spying without a warrant has always been something of a legal fiction: the standard practice is to go ahead and eavesdrop on the conversations of foreigners, even if the party on the other end of the line is an American citizen. Summaries of these conversations are then routinely distributed throughout the relevant government agencies. The privacy of the American citizens involved is putatively preserved by replacing their names with the phrase "U.S. person" in the summary.
During the Bolton hearings, however, it emerged that when he was at the State Department, Mr. Bolton on several occasions received summaries of intercepts between foreigners and "U.S. persons" and requested that the spy agency tell him who those Americans were. Without asking Mr. Bolton to show any cause for his request or going through a review process, the agency complied.
Following this revelation, Newsweek discovered that from January 2004 to May 2005, the National Security Agency had supplied names of some 10,000 American citizens in this informal fashion to policy makers at many departments, other American intelligence services and law enforcement agencies.