New Jersey Governor Mikie Sherrill announced on July 21, 2026, that approximately 6,600 noncitizens had been erroneously registered to vote due to a software error at the state's Motor Vehicle Commission, and the disclosure immediately became a flashpoint in the Trump administration's broader campaign to assert widespread noncitizen voting in U.S. elections. Fewer than 400 of those individuals actually cast ballots, according to The Guardian.

The error originated in New Jersey's automatic voter registration system, which has been in place since 2018 and registers anyone interacting with a motor vehicle office unless they opt out. Between 2023 and 2024, the MVC's software, maintained by vendor IDEMIA, failed to flag individuals who had indicated they were not citizens, resulting in their automatic enrollment on the voter rolls. Sherrill stated she learned of the error during the week of July 13. The governor and IDEMIA are now trading blame over responsibility for the failure, with the vendor asserting that New Jersey approved the registrations, according to the New York Post.

The 6,600 erroneously registered individuals represent a small fraction of New Jersey's more than 6.6 million registered voters. The potential ballots cast from the incorrect registrations would amount to roughly 0.009% of all ballots cast in the state's 2024 general election. Sherrill noted that both Democrats and Republicans were caught up in the error, with the majority unaffiliated with any party. Stephen Richer, the Republican who oversaw elections in Maricopa County, Arizona, from 2021 to 2025, said the incident is not an example of widespread voter fraud and pointed out that most of those erroneously registered did not vote. David Becker, executive director of the Center for Election Innovation and Research, characterized the number as a minuscule fraction of active registered voters.

Those measured assessments have not restrained the political response. Donald Trump and his allies seized on Sherrill's announcement to escalate claims about noncitizen voting. The incident followed Trump's July 16 primetime address, in which he stated: "According to the DHS review, state voter rolls and public records, they identified approximately 278,000 non-citizens who are registered to vote," and further claimed that "Hundreds of thousands of non-citizens and dead people are listed and active on the voter rolls," according to the transcript published by Roll Call's Factbase. The four states Trump's administration has cited for large numbers of noncitizens on voter rolls are California, Nevada, New Jersey, and Pennsylvania. DHS Secretary Markwayne Mullin claimed on or around July 17 that the agency had identified 250,000 noncitizens registered across those four states.

A Guardian review of the DHS letters sent to the states found the agency expressed less certainty about the number of noncitizens on voter rolls than Trump's speech suggested and offered no explanation of its methodology. FactCheck.org published a detailed fact-check of the July 16 speech, and Deutsche Welle separately examined the revived election fraud claims. On Truth Social, Trump claimed that "35,152 is the new number just released by Homeland Security of non-citizens registered to vote in New Jersey," a figure that does not match either the 6,600 announced by Sherrill or the 278,000 figure from his primetime address. The cascading, inconsistent numbers have been a defining feature of the administration's messaging.

The federal pressure on states predates the New Jersey disclosure. The Guardian reported on July 8 that the Trump administration had threatened states with criminal prosecution over federal demands for voter data related to unproven noncitizen voting claims, and that state officials described the demands as "truly bizarre behavior." Now the DOJ is moving from threats to potential action. Harmeet Dhillon, head of the DOJ's civil rights division, sent a letter to Governor Sherrill requesting the names of those who were registered and voted. The department is reportedly mulling prosecutions related to the New Jersey incident, according to Politico.

The New Jersey error is real, documented, and being remediated. What gives it political traction is its timing: it surfaced days after a primetime presidential address built around claims that independent fact-checkers have not corroborated, and it offers the first concrete, state-confirmed instance of noncitizens appearing on voter rolls in a state the administration has targeted. The scale, however, is orders of magnitude below what the administration's rhetoric describes. The gap between the verified 6,600 registrations (fewer than 400 of which resulted in ballots cast) and the 278,000 figure Trump cited nationally is the space where the political contest is playing out. Whether the DOJ pursues prosecutions, and on what legal theory, will determine whether this becomes a narrow administrative correction or a durable front in the administration's election integrity agenda.