MADISON, Wis. (AP) — Wisconsin’s photo ID requirement for voting would be elevated from a state law to a constitutional amendment under a proposal approved Tuesday in the Republican-controlled Assembly with no support from Democrats.

The proposed constitutional amendment will appear on the April 1 ballot for voter consideration. It would need to be approved by voters before the constitution would be amended. Even if voters reject it, the voter ID requirement that has been in state law since 2011 will remain in place.

Republicans, citing Wisconsin polls that showed broad support for voter ID requirements, hailed the measure as a way to bolster election security and protect the law from being overturned in court.

But Democrats said photo ID requirements are often enforced unfairly, making it more difficult for people of color, the disabled and poor people to vote. Democrats argued that lawmakers should focus instead on other issues such as gun control, clean water, affordable housing, and expanding access to child care.

If voters agree to place the photo ID requirement in the constitution, it would make it more difficult for a future Legislature controlled by Democrats to change a law they’ve long opposed.