I agree that the argument being made by the United States is based on the ability of the executive to classify things. What I wrote was that the bulk of the argument is dedicated to the preservation and extension of government power, rather than compliance with the constitution and laws. Where the constitution is mentioned in this document, the government is describing how and why its explicit protections of fundamental rights should be circumvented, in favor of the broad investment of power in the executive.

It should be noted that the government described no limiting principles which would constrict its ability to censor or otherwise coerce any person.