JUNEAU, Alaska — The state has sent more than 3,000 letters to Alaska voters asking them to verify their citizenship ahead of the Aug. 18 primary, a number a top state elections official said is unusually high.

The letters have raised concerns among some state lawmakers, including one who said some constituents who received them are U.S. citizens.

Alaska Division of Elections Director Carol Beecher told state lawmakers during a hearing this week that it appears “a lot of old data was picked up somehow” when the division conducted voter roll maintenance that compares its list with information held by the Division of Motor Vehicles. The process usually yields about 200 names for further review, she said.

Beecher estimated during Wednesday’s hearing that the number of letters sent was around 3,500, but a Division of Elections spokesperson, Steve Kirch, on Thursday said the total was 3,048.

The revelation comes at a time of heightened sensitivity surrounding claims of noncitizen voting. Research and prosecutions have shown it to be extremely rare, but President Donald Trump and his allies have raised alarms since the presidential election cycle two years ago that noncitizen voting is widespread.

The president also has been trying to push voting changes through Congress that would require people to provide documents proving their citizenship to register to vote and a now-halted executive order that sought to create a federal list of verified voters, even though voter rolls are maintained by the states.

The Alaska letter asks recipients to affirm their citizenship status via letter, phone or email, and Beecher said the division is not requiring paperwork or documentation. Those who receive the letter are moved to a list of “inactive” voters. If the division doesn’t hear back from the recipient, they still would be able to cast a special kind of ballot that also requires voters to attest to their qualifications to vote, she said.

“It is not disenfranchising the individual from being able to vote, but it’s a measure the division has to take to make sure that we only have citizens voting,” she said.

People who respond to the letter to say they are citizens will be moved back to the active list, Kirch said.

State Rep. Andrew Gray, a Democrat, said the only people who had contacted his office about the letters were people who are citizens. Another Democrat, state Rep. Ashley Carrick, asked if the letters were related to Alaska’s decision late last year to share detailed data about the state’s voters with the U.S. Department of Justice.

Beecher said it was not: “It has nothing to do with that,” she said, adding: “The information that we have received is specifically from DMV.”

She said the Division of Elections has not heard from the Department of Justice “regarding any list or the list that we provided that they identified noncitizens on that.”

Alaska was one of at least 16 states that have provided or said it would provide to the Trump administration detailed information about its voters — including dates of birth, driver’s license numbers and partial Social Security numbers, according to the Brennan Center. Alaska and Texas also signed agreements. The information is being run through a Department of Homeland Security program that checks for citizenship but has been criticized for its potential to flag eligible voters.

Voting and civil rights groups in Alaska earlier this year sued over the state’s sharing of the information. That case is still pending.

In response to questions, the Division of Motor Vehicles released a memo Thursday saying the Division of Elections in March provided the agency “with a list of approximately 15,200 DMV license and identification applicants and requested that DMV provide citizenship information for these records.” The memo described it as a “nonroutine request.”

The memo said the Division of Elections followed up in June, seeking clarification. The DMV said it responded to say that data it provided “included only those records where DMV’s latest confirmed status for an individual was other than ‘Citizen.’”

Kirch said his agency had sent the DMV its “entire voter list and they ran ours against theirs.”

Beecher, during the legislative hearing, said it remained unclear why the list of voters identified as potential noncitizens was so large this time. It is possible people applied to get a driver’s license before they were citizens and since then became citizens but that didn’t show up in DMV records, she said.

“I believe that people probably don’t realize that all of these governmental entities don’t necessarily talk to each other,” she said.

Kirch gave an example on Thursday. He said if a person was not a citizen some years ago when they received their driver’s license but since became a citizen and registered to vote when they applied for the annual dividend the state pays to residents from its oil-wealth fund, data from the DMV would still show them as not being a citizen.

He said people should update their information with the DMV to ensure they are not flagged in future citizenship checks.