Abbott bragged that Texas purged 6,500 noncitizens from voter rolls. That number was likely inflated.

Charles Stewart III, director of MIT’s Election + Data Science Lab, spoke with ProPublica about some of the challenges related to keeping voter registration rolls up-to-date, particularly since they’re “naturally fluid.” “So long as we have requirements about keeping lists clean…we’re going to come across these sorts of problems,” he says.