Curse this timeline for making me so often think, "Bill Kristol is right," but this is correct, Trump seems to have figured out that by shouting NATIONAL SECURITY he can justify building these things. We should really, really not let him do that.
Trump's panicking about the widespread revulsion against his Arch, and is trying to cloak it in national security to jam it through or go around the normal approval process.
It's even more important to stop it now, as a test case of not letting him use "national security" to justify illegal acts.