One of the important federal court decisions recognizing the president's inherent authority to order warrantless foreign intelligenc surveillance is the Truong case, discussed in John's analysis of the legality of the NSA surveillance program. John noted that the Fourth Circuit decided United States v. Truong in 1980 and that the case involved a criminal prosecution arising out of the defendant’s spying on behalf of the Socialist Republic of Vietnam. The case squarely presented the issue of the executive branch’s inherent power to conduct warrantless surveillance for national security purposes:

The defendants raise a substantial challenge to their convictions by arguing that the surveillance conducted by the FBI violated the Fourth Amendment and that all the evidence uncovered through that surveillance must consequently be suppressed. As has been stated, the government did not seek a warrant for the eavesdropping on Truong’s phone conversations or the bugging of his apartment. Instead, it relied upon a “foreign intelligence” exception to the Fourth Amendment’s warrant requirement. In the area of foreign intelligence, the government contends, the President may authorize surveillance without seeking a judicial warrant because of his constitutional prerogatives in the area of foreign affairs.

The court agreed with the government’s position:

For several reasons, the needs of the executive are so compelling in the area of foreign intelligence, unlike the area of domestic security, that a uniform warrant requirement would, following [United States v. United States District Court, 407 U.S. 297 (1972)], “unduly frustrate” the President in carrying out his foreign affairs responsibilities. First of all, attempts to counter foreign threats to the national security require the utmost stealth, speed and secrecy. A warrant requirement would add a procedural hurdle that would reduce the flexibility of executive foreign intelligence activities, in some cases delay executive response to foreign intelligence threats, and increase the chance of leaks regarding sensitive executive operations.

The court held that warrantless searches for foreign intelligence purposes are constitutional, as long as the “object of the search or the surveillance is a foreign power, its agent or collaborators,” and the search is conducted “primarily” for foreign intelligence reasons.

In his performance at Mrs. King's funeral this week, the execrable Jimmy Carter obviously chided President Bush by reference to the "secret government wiretapping" of Martin Luther King. In today's Washington Times, Charles Hurt recalls that it was of course Jimmy Carter himself (and Attorney General Bell) who authorized the warrantless surveillance involved in the Truong case.