The Trump administration has, for the first time ever, built a searchable national citizenship data system.

The tool, which is being rolled out in phases, is designed to be used by state and local election officials to give them an easier way to ensure only citizens are voting. But it was developed rapidly without a public process, and some of those officials are already worrying about what else it could be used for.

NPR is the first news organization to report the details of the new system.

For decades, voting officials have noted that there was no national citizenship list to compare their state lists to, so to verify citizenship for their voters, they either needed to ask people to provide a birth certificate or a passport — something that could disenfranchise millions — or use a complex patchwork of disparate data sources.

Now, the Department of Homeland Security is offering another way.

DHS, in partnership with the White House’s Department of Governmental Efficiency (DOGE) team, has recently rolled out a series of upgrades to a network of federal databases to allow state and county election officials to quickly check the citizenship status of their entire voter lists — both U.S.-born and naturalized citizens — using data from the Social Security Administration as well as immigration databases.

Such integration has never existed before, and experts call it a sea change that inches the U.S. closer to having a roster of citizens — something the country has never embraced. A centralized national database of Americans’ personal information has long been considered a third rail — especially to privacy advocates as well as political conservatives, who have traditionally opposed mass data consolidation by the federal government.

Legal experts told NPR they were alarmed that a development of this magnitude was already underway without a transparent and public process.

“That is a debate that needs to play out in a public setting,” said John Davisson, the director of litigation at the nonprofit Electronic Privacy Information Center. “It’s one that deserves public scrutiny and sunlight, that deserves the participation of elected representatives, that deserves opportunities for the public to weigh in through public comment and testimony.”

When federal agencies plan to collect or use Americans’ personal data in new ways, there are procedures they are required to follow beforehand, including giving public notice.

Another privacy expert, University of Virginia School of Law professor Danielle Citron, called this data aggregation effort a “hair on fire” development. She told NPR she has questions if the project itself is lawful.

Many other questions about the new system remain, including which states plan to use it and how, what sort of data security measures are being taken and how trustworthy the data the tool provides will be. It’s also unknown what the federal government plans to do with the voter records after they’ve been run through the system.

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