As Kentucky legislators advance a bill to require voters to show a government-issued ID to cast a ballot, a civil liberties group says it might mount a challenge if the bill becomes law.

The Republican-backed measure cleared a House committee on a party-line vote Thursday. Opponents raised concerns the photo ID requirement could suppress turnout among minorities, the elderly and disabled voters.

They also objected to having the bill take effect for this year’s November election. The American Civil Liberties Union of Kentucky said such a quick implementation would create voter confusion.

Its legal director says the group is likely to challenge “such a rushed implementation.”

Secretary of State Michael Adams said requiring a photo ID will restore confidence in the voting process, but added he is open to compromise.

“I sincerely want a bill that is workable, that actually does what it’s intended to do, that also doesn’t have externalities that are negative. I also want a bill that will be constitutional,” said Adams.

The bill does allow people to vote without an ID if they sign an affidavit swearing they are who they claim to be.