You don't, but also you don't have to. Voter rolls are cross referenced with other sources of data to verify citizenship. ID is required to submit a non-provisional ballot even during early voting if you're not in your designated precinct.

Also just generally it's a severe federal crime to vote illegally, so people who are here illegally aren't out en masse publicly tying their identity to federal felonies.

One of voter ID's biggest advocates, the Heritage Foundation, could only find 68 cases of non-citizens voting since 1980. Even if all of them are repeat offenders, that's a few hundred bad ballots out of billions cast. As you said, it is also possible to catch these people. Our election integrity is not threatened by non-citizen voters. It just doesn't happen on the scale that Republicans insist it must be happening, and the fact that they keep repeating it doesn't make it true, it means that they have an agenda that benefits from making you think it's true.

Ok? And yet, they were caught. Dude's a shithead, swung zero elections, and got caught. They catch people all the time voting illegally. I would make a strong guess that they counted zero of his ballots as they were all provisional.

He should go to jail and yet his existence is not proof that there are hoards of African deportees voting in state and federal elections.