> My state does all elections by mail now. How would this even work?

Trump told Congress to ban most mail ballots.

> All this is on top of the fact that elections are run by the states, not the national government. Would such a law even be constitutional?

Experts said no. But this Supreme Court surprised experts before. And the constitution said Congress could decide elections of Congress. They have the power. They need an explanation enough people would accept.

Yeah, I think most people who want proof of citizenship are forgetting that your driver's license (even your REAL ID) isn't a proof of citizenship. It's passport, certificate of naturalization, or birth certificate.

Restricting voting to people with passports and who happen to have a birth certificate handy is going to make the first election with the requirement weird as hell and probably backfire on Republicans if their goal is winning at any cost.

Requiring some form of ID that your state is willing to accept as good enough is a very different beast than proof of citizenship.