National Security™ was invoked to justify the tariffs imposed a few years ago on Canadian aluminum imports into the United States. [1]
Since the sole arbiter of what constitutes a national security matter is the executive branch, whether or not it represents a material threat to national security is very much up for debate, proclamations aside.
Since the sole arbiter of what constitutes a national security matter is the executive branch, whether or not it represents a material threat to national security is very much up for debate, proclamations aside.
[1] https://www.whitehouse.gov/presidential-actions/proclamation...