Gov. Rick Scott insists Florida’s voter rolls must be scrubbed carefully to remove any non-U.S. citizens, but his administration is keeping secret a list of more than 180,000 voters whose citizenship may be in question. Scott’s elections agency is refusing numerous requests from voter advocacy groups and news outlets to release the list, months after the state released an initial list targeting 2,625 potential noncitizens. Many people on the first list turned out to be citizens. The larger list has the potential to cause a bigger political controversy than the smaller one. “I want to be very careful,” said Scott’s chief elections official, Secretary of State Ken Detzner. “It’s individuals’ names on there, and I want to make sure that people are treated respectfully. I want to be abundantly cautious about that.”