Answer:
The correct answer to the following question will be "Legally".
Explanation:
- The U.S Foreign Intelligence Surveillance Court is a federal court of U.S established by the 1978 (FISA) to supervise federal law applications for monitoring justifies against foreign agents inside the U.S.
- While FISA isn't a constitutionally available weapon in the war against domestic terrorism, its electronic monitoring and visual surveillance authority are legitimate and also very successful ways of tracking the actions of western powers and representatives of foreign powers when working across the U.S.
Therefore, it's the right answer.