Better yet, have ice set up in front of polling places with facial recognition cameras on the entrances. There can be no argument made that a legal citizen would be disenfranchised. The only person dissuaded from voting would be a criminal Invader with an existing order for deportation.
And not just illegals voting is a problem but more “registered voters” than eligible voters, or even residents, in some locations. And computer tampering, boxes of paper votes “lost”, etc.