Kansas lawmakers have learned that administrative issues are likely to linger from a state law requiring new voters to provide proof of their U.S. citizenship.

The issue arose Monday because Department of Revenue officials told a legislative committee they don’t have a timetable for requiring everyone who seeks to renew a driver’s license to provide citizenship documents.

People can fill out voter registration forms at driver’s license offices. Some legislators assumed that people renewing driver’s licenses would be required to provide citizenship documents and therefore comply at the same time with the proof-of-citizenship rule for new voters.

But more than 16,600 prospective voters have their registrations on hold because they haven’t provided proof of their citizenship. Many filled out registration forms at driver’s license offices.