Well, we are talking speculatively, now. I said if I were “king.”
But I am not actually in favor of a monarchy. So, yes, if we are heading towards reality, I believe it is the business of duly elected and accountable law making bodies of the state to make these laws. And the state’s job to enforce them.
Constitutionally, perhaps the feds can assist in pragmatic ways such as communications or some such, inter-border stuff, I don’t know.
What you describe seems to be substantially different than the drug war.