"Has it been confirmed this was done on American citizens? "
Does it matter?
If there is probable cause (about as low a threshold as it gets) to suspect that anybody, citizen or not, is providing information, assistance, logistics, monies, transportation, identities, etc., to our sworn enemies in this time of war, why the objection to "spying"?
driveserve
No, it doesn't matter as far as I am concerned.