[MissMillie]

Be careful with that link:

(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; and

[bobsunshine]

Thanks for the heads-up. Here are my thoughts.

1. If the person is not a US person, which includes persons with temporary visas, then the NSA is within the law.

2. If the person is a US person but "provides material support" to a terrorist group, per the definitions in 1801(b), they are an "agent of a foreign power" and no longer a US person.

That's my logic. I'm sure there are other points regarding the 4th Amendment and the War Powers act.