I'm confused. The NSA has basically unlimited powers under the premise that it does not spy on US citizens. So if US citiziens ask what data the NSA has on them, what other legal answer could there be other than 'none'? And what secrets would be revealed in that answer, given that the NSA has been mandated not to spy on US citiziens?
The NSA can intercept US citizens' international communications under roughly the same theory that allows customs officials to search you at the border without probable cause.
