The warning of a threat to national security has been used throughout US history as a means for the US government to execute repressive actions. Even today, the judiciary must take responsibility for defending citizens against such potential abuses by the executive branch.
Eric K. Yamamoto,
White (House) Lies: Why the Public Must Compel the Courts to Hold the President Accountable for National Security Abuses,
68 Law and Contemporary Problems
Available at: http://scholarship.law.duke.edu/lcp/vol68/iss2/13