Trump's noncitizen voter data remains a mystery. But the claims raise midterm fears

Trump officials say they found 250,000 noncitizens on voter rolls in just four states. Those states don't know where the numbers came from, and some worry what the claims may portend for the midterms.

<img src='https://npr.brightspotcdn.com/dims3/default/strip/false/crop/6000x4001+0+0/resize/6000x4001!/?url=http%3A%2F%2Fnpr-brightspot.s3.amazonaws.com%2Ff4%2Fbb%2F72b330f74fe0a52c7b865b1f441a%2Fgettyimages-2286523203.jpg' alt='Secretary of Homeland Security Markwayne Mullin answers questions from reporters on July 17 after remarks about his agency alleging that more than 250,000 non-U.S. citizens are on the voter rolls in just four states. Those states dispute that tally.'/><p>Trump officials say they found 250,000 noncitizens on voter rolls in just four states. Those states don't know where the numbers came from, and some worry what the claims may portend for the midterms.</p><p>(Image credit: Anna Moneymaker)</p><img src='https://media.npr.org/include/images/tracking/npr-rss-pixel.png?story=nx-s1-5906708' />