evidence: "We have a number of states who have done audits of their voter rolls and found thousands of noncitizens on their voter rolls. And it’s in some of the swing states — Pennsylvania, Ohio, Georgia — states that could determine the outcome of the election," Johnson told CNN’s Jake Tapper. [...] Critics argue it’s already illegal for noncitizens to vote and the risk of prosecution and deportation is an effective deterrent for people who have already sacrificed to come to the US. It’s already a best practice for states to check voter registrations against their Department of Motor Vehicles or Social Security files, and reviews of voter rolls have shown very few noncitizens try to vote. [...] Gov. Greg Abbott, a Republican, announced last month that an ongoing, yearslong review of voter rolls in Texas, which has nearly 18 million voters, had identified more than 6,500 "potential" noncitizens on the voter rolls. Of those, less than 2,000 have a voter history. He referred the latter to the state attorney general’s office "for investigation and potential legal action," but no one has been accused of voting illegally.