> I am not sure what happens if it is found unconstitutional in some of the countries concerned. The general principle is that EU law takes precedence over nat

> I am not sure what happens if it is found unconstitutional in some of the countries concerned. The general principle is that EU law takes precedence over national laws, including national constitutions. If a member state finds a law unconstitutional, they have a few options. They could try to convince everyone else to change the law. They could change their constitution. They could leave the EU. Or they could just ignore the law and face the political and financial consequences. In some sense, the EU is no different from any other legally binding international treaty. It's a package deal, so you can't avoid the aspects you don't like. But because treaties are between sovereign states, it's always possible to leave them.