I did answer your question nimrod ... the law is not "law" in anything other than name if it cannot be enforced. The federal government can legally and morally use force to stop any state government/institution from denying the constitutionally granted rights of an American citizen. Ergo ... if Alabama, or Michigan for that matter, refuses to let black children into a public school the federal goverment has the power and authority to ensure the rights of that black child exist in fact in Alabama.
Why is this difficult for you?
Protecting the rights and liberty of citizens is the legitimate role of government ... regardless of who is President.