The NSA provided a preliminary response Saturday that said Congress has "the same privacy protections as all U.S. persons."
"NSA's authorities to collect signals intelligence data include procedures that protect the privacy of U.S. persons. Such protections are built into and cut across the entire process. Members of Congress have the same privacy protections as all U.S. persons," said the agency in a statement obtained by CNN.
The response goes on to promise the agency will continue to work with Congress on the issues - without ever addressing the senator's real question.
Sanders defines "spying" in his letter as "gathering metadata on calls made from official or personal phones, content from websites visited or e-mails sent, or collecting any other data from a third party not made available to the general public in the regular course of business."