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Your reading of FISA is incorrect.

Section 1802, subsection (a)(1)(A)(i) states that warrantless electronic surveillance can only be directed at communications that are "exclusively between or among foreign powers". The definition of foreign powers comes from Section 1801, subsection (a)(1)(2)(3):

(a) “Foreign power” means—
(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;

Note that the definition of a foreign power does not include subsections (4)(5) and (6) of 1801(a).

And then there is there is Section 1802, subsection (a)(1)(B) which states that warrantless electronic surveillance can only be conducted when "there is no substantial likelihood that the surveillance will acquire the contents of any communication to which a United States person is a party". The definition of a United States person comes from Section 1801, subsection (i):

“United States person” means a citizen of the United States, an alien lawfully admitted for permanent residence (as defined in section 1101 (a)(20) of title 8), an unincorporated association a substantial number of members of which are citizens of the United States or aliens lawfully admitted for permanent residence, or a corporation which is incorporated in the United States, but does not include a corporation or an association which is a foreign power, as defined in subsection (a)(1), (2), or (3) of this section.

There is no way around it. Under FISA, it is plainly illegal to conduct warrantless electronic surveillance on a US citizen (even if that person is involved in terrorism).

Article II of the Constitution, to defend the United States,

trumps FISA.

FISA attempts to limit the power of the commander-in-

chief to

conduct warfare by its attempt to transfer the power to

judges, to decide some sort of pre-requisite to surveil

terrorists and enemies.

Besides,here`s what can already be done without a warrant:

Detain American citizens for investigative purposes without a warrant;

Arrest American citizens, based on probable cause, without a warrant;

Conduct a warrantless search of the person of an American citizen who has been detained, with or without a warrant;

Conduct a warrantless search of the home of an American citizen in order to secure the premises while a warrant is being obtained;

Conduct a warrantless search of, and seize, items belonging to American citizens that are displayed in plain view and that are obviously criminal or dangerous in nature;

Conduct a warrantless search of anything belonging to an American citizen under exigent circumstances if considerations of public safety make obtaining a warrant impractical;

Conduct a warrantless search of an American citizen's home and belongings if another person, who has apparent authority over the premises, consents;

Conduct a warrantless search of an American citizen's car anytime there is probable cause to believe it contains contraband or any evidence of a crime;

Conduct a warrantless search of any closed container inside the car of an American citizen if there is probable cause to search the car — regardless of whether there is probable cause to search the container itself;

Conduct a warrantless search of any property apparently abandoned by an American citizen;

Conduct a warrantless search of any property of an American citizen that has lawfully been seized in order to create an inventory and protect police from potential hazards or civil claims;

Conduct a warrantless search — including a strip search — at the border of any American citizen entering or leaving the United States;

Conduct a warrantless search at the border of the baggage and other property of any American citizen entering or leaving the United States;

Conduct a warrantless search of any American citizen seeking to enter a public building;

Conduct a warrantless search of random Americans at police checkpoints established for public-safety purposes (such as to detect and discourage drunk driving);

Conduct warrantless monitoring of common areas frequented by American citizens;

Conduct warrantless searches of American citizens and their vessels on the high seas;

Conduct warrantless monitoring of any telephone call or conversation of an American citizen as long as one participant in the conversation has consented to the monitoring;

Conduct warrantless searches of junkyards maintained by American citizens;

Conduct warrantless searches of docks maintained by American citizens;

Conduct warrantless searches of bars or nightclubs owned by American citizens to police underage drinking;

Conduct warrantless searches of auto-repair shops operated by American citizens;

Conduct warrantless searches of the books of American gem dealers in order to discourage traffic in stolen goods;

Conduct warrantless drug screening of American citizens working in government, emergency services, the transportation industry, and nuclear plants;

Conduct warrantless drug screening of American citizens who are school officials;

Conduct warrantless drug screening of American citizens who are school students;

Conduct warrantless searches of American citizens who are on bail, probation or parole