[ExSoldier]

Other posters on-thread have identified the correct approach, institute state requirements for proof. I am absolutely amazed that some conservative state has not yet done so (OK or SC, for instance).

I thought Iowa did this recently.

[Wonder Warthog]

"I thought Iowa did this recently."

I haven't heard so. If they have, GREAT! ALL states should have such a written requirement. IMO, they already HAVE the requirement as part of their duties to assure legal elections and legal candidates, and have failed in that duty. That NONE had done so is a significant flaw in our electoral process.