Not exactly - and that's why FISA is so controversial. The FISA Amendment Act permits the court to issue a warrant if either the sender or recipient is a non-U

Not exactly - and that's why FISA is so controversial. The FISA Amendment Act permits the court to issue a warrant if either the sender or recipient is a non-US citizen abroad (since the "target" can be either party involved in the communication). Foreign nationals who are acquired abroad as FISA targets can later enter the US and remain subject to the warrant. And if there is uncertainty about the location or nationality of the target, the dispute is frequently resolved in favor of the surveillance agency. The ACLU has fought FISA since it was enacted, as they believe it creates a way to unconstitutionally surveil people in the United States.