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

Two weeks after Trump officials said they had found more than 250,000 non-U.S.citizens on voter rolls in just four states, election officials are still struggling to understand where the numbers came from, and what the claims may portend for federal interference in this year's midterms.Multiple state officials told NPR they fear these unverified numbers, or similar ones unveiled closer to the general election, could be used as pretext for warrants to allow law enforcement to interfere in vote-counting.
Several reviews in recent years have found that actual voting by noncitizens is extremely rare.The Department of Homeland Security, which oversaw the voter roll analysis of four states — California, Nevada, New Jersey and Pennsylvania — asked the states to respond to its allegations by Thursday.But the agency has not explained its methodology or provided the states with clarity on how it came to its conclusions."These numbers, until they're backed up by any kind of clear, transparent methodology, should be considered made up," said David Becker, the executive director of the Center for Election Innovation & Research.At least three of the four states' top election officials wrote back to Homeland Security Secretary Markwayne Mullin, raising questions about the accuracy of the numbers and demanding answers on how DHS did the analysis.Making matters even more puzzling, the Department of Justice previously sued all four states, along with more than two dozen more, for refusing to turn over versions of their voter rolls that include voters' partial Social Security numbers and driver's license numbers.
Those lawsuits have so far been unsuccessful.Yet Mullin's letters to the states indicate his agency somehow obtained some of that sensitive data anyway.The letters say DHS analyzed publicly available voter rolls in the four states.
But public voter rolls don't include Social Security numbers, and the letters say the agency found around 118,000 voters combined in th...