If you're prepared to accept the decision of a branch of the feral government that the actions of...the feral government, are Constitutional. I'll bet a lot of people, and states, are not so prepared.
Prepared or not, short of a constitutional recourse, they have no LEGAL recourse. They can rebel. Or they can call a convention. Actually, they ought to call a convention. That would be the “proper” thing to do. Rebellion, technically, should be a last resort, and unless you’ve called a Constitutional Convention, you have not exhausted your legal options.