Duh. And what explicit numerated power in the US Constitution allows the US government to do that? Answer: there is none. And don’t give me bs about the commerce power. Ditto for export restrictions on a number of other items. It just doesn’t exist. So many conservatives say they support the Constitution, but they really don’t.
The necessary and proper clause (also known as the elastic clause, the basket clause, the coefficient clause, and the sweeping clause. This clause is a loophole big enough to drive a Hummer through, which is probably why the Framers put it in the Constitution in the first place.