evidence: Johnson also later referenced Texas as a state where undocumented immigrants have tried to register to vote. [...] 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. [...] CNN has also fact-checked claims of widespread voting by undocumented immigrants.