I don't believe that the US has any obligation to protect the right to privacy of non-US citizens living in foreign countries. To do so would be to place a burden on it that no other state shares.
It is well-established principle that a country's intelligence agencies, whether human or electronic-focused, are not required to respect the privacy of those in other countries. While you're saying that the NSA should be forbidden from spying on foreign citizens, my own country has no qualms about collecting intelligence on American citizens, which I believe it does regularly, nor does any other state.
The real issue at hand here is why the NSA, an agency ostensibly prevented by law from spying on American citizens, is doing just that.
It is well-established principle that a country's intelligence agencies, whether human or electronic-focused, are not required to respect the privacy of those in other countries. While you're saying that the NSA should be forbidden from spying on foreign citizens, my own country has no qualms about collecting intelligence on American citizens, which I believe it does regularly, nor does any other state.
The real issue at hand here is why the NSA, an agency ostensibly prevented by law from spying on American citizens, is doing just that.