States named in the DHS analysis say the number cannot be checked without underlying records, while NPR and Reuters reporting describe a dispute over evidence, timing and methodology.
The immediate problem for election offices is not the citizenship rule. Noncitizens may not vote in federal elections.
The problem is whether states can verify a federal allegation before it becomes election-season fuel. According to NPR, the Department of Homeland Security said on July 17 that it had found more than 250,000 non-U.S. citizens on voter rolls in California, Nevada, New Jersey and Pennsylvania.
Those states dispute the tally. NPR reported that officials have been seeking clarity on how DHS produced the number, while Reuters reporting has challenged whether Trump’s broader claims show a sweeping national problem or something far narrower.
What states say they still do not have
Election officials are not saying voter rolls should be left unchecked. They are saying a large allegation cannot be responsibly evaluated without the records behind it.
Nevada Secretary of State Cisco Aguilar, a Democrat, told NPR that DHS had not provided the names of Nevada registered voters the agency says may be noncitizens. Without names, the state cannot test the claim case by case.
NPR reported that officials in the four named states were still trying to determine how Homeland Security reached its figure. At least three top election officials wrote back to the agency asking for more information about the analysis.
DHS asked the four states to respond to its allegations by Thursday, according to NPR, but the agency had not explained its methodology or provided the clarity states said they needed.
The legal rule is clear; the evidence is disputed
Federal law bars noncitizens from voting in federal elections. That legal baseline is not the contested point.
Trump has portrayed alleged noncitizen voting as a threat to democratic self-government and has argued that illegal voting by noncitizens is widespread. Those claims are central to the political fight now surrounding the DHS tally.
The evidentiary fight is different. State officials and election experts cited by NPR are asking what records were matched, how current those records were and whether the process separated outdated information from confirmed ineligible voters.
A voter-roll entry can be stale, duplicated or incomplete without proving that an ineligible person cast a ballot. That distinction is why officials are pressing for the underlying data rather than responding only to a total.
Why database matches can overstate a problem
Large database comparisons can appear exact while still producing false positives. The risk increases when records come from different systems, are outdated or lack a reliable unique identifier.
NPR reported that DHS letters described matches using names, dates of birth, addresses and Social Security numbers. Public voter rolls do not include Social Security numbers, raising questions about what data was used and how the matching was performed.
Election experts cited by NPR have warned that searches for noncitizens on voter rolls can begin with large preliminary numbers that shrink after review. One reason is that a person listed in an older government file as a noncitizen may later have become a U.S. citizen.
David Becker, executive director of the Center for Election Innovation & Research, told NPR: “These numbers, until they’re backed up by any kind of clear, transparent methodology, should be considered made up.”
The court fight over voter-roll data adds context
The dispute is also unfolding alongside litigation over access to voter-roll information.
The Department of Justice had previously sued California, Nevada, New Jersey, Pennsylvania and more than two dozen other states seeking voter-roll versions with partial Social Security and driver’s license data.
NPR reported that the Nevada case is still pending. Federal judges have dismissed suits in California, New Jersey, Pennsylvania and 15 other states, according to the same reporting.
That legal backdrop matters because the DHS allegation depends on data matching, while states say they need to know exactly what was matched before they can verify or correct any records.
Timing is now part of the dispute
Election Day is less than 100 days away, which makes an unresolved voter-roll allegation more than a paperwork fight.
State offices are preparing for voting, counting and certification. If new or similar numbers appear close to Election Day, officials may have little time to examine individual records before the claims shape public debate.
NPR reported that multiple state officials feared unverified numbers could be used as a pretext for warrants allowing law enforcement to interfere in vote-counting. That fear is not proof such interference will happen, but it explains why transparency has become central.
NPR also reported that several reviews in recent years have found actual voting by noncitizens to be extremely rare.
The test now is transparency
The practical next step is narrow: provide the underlying records, explain the matching method and let states review any flagged registrations under existing election law.
That would not settle every political argument over election integrity. It would, however, separate verifiable cases from disputed totals.
Until that happens, the DHS number remains an allegation cited in a broader Trump-led warning about noncitizen voting, not a settled finding that states have been able to confirm.
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