FISA warrants are not the same thing as search warrants, in the same sense that an arrest warrant is not the same thing as a search warrant.
FISA "warrants" are really an oversight mechanism to the executive's generally accepted authority to conduct national security operations targeted at foreign powers. They're specifically to "warrant" that the Fourth Amendment is not being violated by a particular search, intercept, or program because the activity is appropriately targeted.
FISA "warrants" are really an oversight mechanism to the executive's generally accepted authority to conduct national security operations targeted at foreign powers. They're specifically to "warrant" that the Fourth Amendment is not being violated by a particular search, intercept, or program because the activity is appropriately targeted.