Subject: Re: HCR Gives a History Lesson
But the federal government does not have the authority to require states to enforce federal law. States have to comply with federal law, but they cannot be required to assist the federal government in enforcing federal law against other people. And they certainly can't be required to assist the federal government in the absence of any federal statute requiring it.

Is This explicitly stated somewhere in the Constitution, or is it only true because it wasn't stated that the states ARE required to enforce federal law?