Brennan Center report predicts mass voter challenges likely in midterm elections

WASHINGTON — Mass voter challenges are likely to occur in the 2026 midterm elections, the Brennan Center for Justice warned Tuesday, with the potential to “undermine the democratic process.”

President Donald Trump and the Republican Party have been laying the groundwork for questioning the election process in state after state, as Trump has made “election integrity” the centerpiece of his recent domestic policy initiatives, including in a July 16 address

The center, at NYU School of Law, found in a report Tuesday that more than 185,000 challenges to voter eligibility were filed by private citizens in 2024, though “the real number is likely higher” since many election officials either were not contacted or sent incomplete responses to an inquiry. The center is regarded as left-leaning.

Mass challenges are a fairly recent development, spurred by improvements in election technology and transparency. Thousands of votes now can be challenged at once.

They’ve rarely been successful, but experts worry they create voter doubts about whether elections are being conducted fairly. Historically such challenges have also often been used to suppress the votes of people of color, a separate brief said.

“Eligible voters facing challenges sometimes don’t vote simply because the process is too confusing. Responding to a challenge requires numerous steps that can trip up voters. They may not understand their options for verifying their identity,” said the report by Brennan Center Counsel Andrew Garber.

Garber found that “mass voter challenges have become a key element in the campaign to use election integrity as a pretext for voter suppression.”

In 2024, he found, election deniers lodged challenges, “in addition to spreading lies about widespread voter fraud, refusing to certify elections, discrediting voting machines, engaging in bad faith poll watching, filing frivolous lawsuits, and threatening election officials with physical harm or criminal penalties” 

This year, Garber warned, such challenges are likely to be an “integral strategy in the playbook to undermine the democratic process.”

Mass challenges, he said, “add basically zero value to elections while creating new costs.”

One big worry, though: “There are instances of eligible voters being removed from the rolls and learning of their removal after the deadline to register and vote in the next election,” the report said. “As is often the case with voter suppression, vulnerable individuals frequently suffer the effects.”

Mullin threats

The Trump administration is pushing state officials to examine their voter rolls and tighten their election security, thus opening the door for the help of the federal government in conducting mass challenges, the report predicted.

Homeland Security Secretary Markwayne Mullin said last week that hundreds of thousands of noncitizens are registered to vote in California, New Jersey, Nevada and Pennsylvania and threatened to prosecute election officials in states that don’t “participate in securing the elections” ahead of the November midterms. He has not specified the source of his data.

Trump has demanded Congress require people to show proof of citizenship when they register to vote and photo IDs at the polls. So far, lawmakers have so far been reluctant to approve the SAVE America Act that in various versions would restrict voting, and it remains stalled in the U.S. Senate. 

Trump and his allies have maintained for years the 2020 election was marred by voter fraud. No evidence of any widespread fraud has been found.

Election officials have largely maintained their rolls are accurate and up to date.

“In most states, list maintenance practices tend to keep pace with natural changes in voters’ lives, such as moving,” said a report this month by the nonpartisan Center for Election Innovation & Research.

Mass challenges

Recent mass challenges have rarely been successful.

The report cited efforts in Georgia, Michigan, Texas, Florida and Iowa in 2022.

“These challenges were widely rejected for lack of evidence or failure to comply with state law,” the Brennan Center found.

In 2024, Brennan’s research found that private citizens filed at least 185,232 voter challenges in the states studied. Of those, the center found officials accepted at least 5,477. That means they may have removed the voter from the rolls, declared them inactive or taken other steps to make it difficult for them to vote.

Researchers sent requests to Arizona, Florida, Georgia, Michigan, Nevada, North Carolina, Ohio, Pennsylvania, and Texas and to numerous counties in those states, the report methodology said.

“One takeaway is evident: With only around 3 percent of challenges clearly accepted, challenges contributed little to list maintenance in 2024,” Brennan found.

For instance, Georgia got in touch with about 875,000 voters in 2023 who had moved or had not voted for several years. That was more than a hundred times the number of Georgia voters who were successfully challenged the next year.

The center compiled the report by sending public records requests to 42 state and local government entities. It asked for any documents involving voter challenges in 2024 and how officials dealt with those challenges. It also looked at court filings, public reporting and election board meetings.

“Acquiring a complete record of challenges is impossible: They are often made ad hoc, officials may have no obligation to track them, and the records produced are often incomplete,” the center noted, adding that some officials refused to provide records or said they got no challenges.