“We’re going to vet a list of 180,000 people to try to come up with a real number,” said Chris Cate, a spokesman for Florida’s Division of Elections. “We don’t want to jump to conclusions without a thorough investigation.”

Officials in Florida have so far identified more than 2,600 potential voters who may not be U.S. citizens and sent their information to local election authorities, Cate said.

Drivers in Florida are required to show proof of their legal status when they get a driver’s license or renew an old one.