Quote from AAAintheBeltway:
Kent,
Let me add something.
(a) âForeign powerâ meansâ
(1) a foreign government or any component thereof, whether or not recognized by the United States;
(2) a faction of a foreign nation or nations, not substantially composed of United States persons;
(3) an entity that is openly acknowledged by a foreign government or governments to be directed and controlled by such foreign government or governments;
(4) a group engaged in international terrorism or activities in preparation therefor;
(5) a foreign-based political organization, not substantially composed of United States persons; or
(6) an entity that is directed and controlled by a foreign government or governments. 50 USC 1801.
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Under sec. 1802 the government can wiretap "foreign powers" without a warrant. 1801(a)4 defines groups like al qaeda as foreign powers. 1801(b)2 makes it clear that "agents of a foreign power" can include US citizens. While perhaps not a model of clarity, the staute therefore would seem to allow warrantless tapping of citizens in communications with overseas terrorists groups.
Here's the statute:
"50 U.S.C 1802(a) (1) Notwithstanding any other law, the President, through the Attorney General, may authorize electronic surveillance without a court order under this subchapter to acquire foreign intelligence information for periods of up to one year if the Attorney General certifies in writing under oath thatâ
(A) the electronic surveillance is solely directed atâ
(i) the acquisition of the contents of communications transmitted by means of communications used exclusively between or among foreign powers, as defined in section 1801 (a)(1), (2), or (3)..." (emphasis added)
The last part of subsection (a)(1)(A) restricts the warrantless searches to "foreign powers" only -- not to "foreign agents," which are defined in subsection (b)(1).
The President cannot use this law to justify warrantless wiretaps on U.S. persons.