Deals with the Devil. To bind is to be bound thus. And supranational responsibility always trumps domestic policy. Where one is seen to exert influence beyond one's borders, one concedes a certain room for manoeuvre. And even should you find a way to circumvent it, the ensuing precedent allows for all signatory members to do likewise. Which is why it never happens. One thing I don't get. If the Constitution specifically stipulates that it may be undermined by exterior influence, what was the point at all? I'm actually surprised by this 'Supremacy Clause'. It would not seem in keeping with the overall tone of liberty and protection it purports to extol. Because even if policies generated from within the sovereign border were unpopular, they could be implemented via collusion with foreign entities. So must 'We the people' include those from any corner of the globe? In that light, the Constitution appears as something approaching an international referendum. And your Founding Fathers were Globalists. No offence intended. At first glance, it's the mother of all loopholes.