The ignorance of the facts surrounding FISA and the NSA are not surprising. It doesn't seem to matter how many times people are shown the truth, they return to the talking points as if it never happened.
Here it is again:
§ 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 that—
(A) the electronic surveillance is solely directed at—
(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) of this title; or
(ii) the acquisition of technical intelligence, other than the spoken communications of individuals, from property or premises under the open and exclusive control of a foreign power, as defined in section 1801 (a)(1), (2), or (3) of this title;
(B)
there is no substantial likelihood that the surveillance will acquire the contents of any communication to which a United States person is a party;
SOURCE:
Cornell University Law School
All cases where there IS a likelihood of a US person being the target of surveillance, a warrant is required.