() Wisconsin residents approved an amendment to the state constitution Tuesday that cements a previous state law that requires voters to provide photo identification and protects it against future legal challenges.

A state law passed in 2011 required voters to show photo ID at their polling place, but with Tuesday’s approval of the constitutional amendment that was pushed by Republicans, overturning the law becomes much tougher.

The ballot measure was passed on the same day when Wisconsin voters pushed a Democratic Party-backed candidate for the state Supreme Court to an apparent victory. Decision Desk HQ projected Tuesday night that Susan Crawford defeated Republican Brad Schimel for the seat on the Supreme Court after Schimel received heavy support from President Donald Trump and Elon Musk.

The Associated Press called the results of the Voter ID referendum, showing that 62.8% of voters approved adding the requirement to the state constitution. The referendum marks a victory for Republicans, who maintain control of the state legislature. However, heading into Tuesday’s election, lawmakers said they wanted to ensure that the state Supreme Court could not overturn the 14-year-old state law.

“I am unwilling to let this basic election integrity measure be overturned by the state Supreme Court,” Wisconsin Republican Sen. Van Wanggaard, a co-author of the measure, said earlier this year, according to the Associated Press. “The only way to ensure this stays the law of the land is to put it in the constitution.”

Trump praised the result of the measure passing in a Truth Social post, calling it a “big win for Republicans maybe the biggest win of the night.” Trump also wrote that Democrats were pushing against the measure “presumably so they could cheat.”

Trump also said the measure passing should ensure victories for Republicans for many years to come.

Republicans had pushed for the constitutional amendment for years, The New York Times reported. Conservatives across the country have pushed for stricter voter ID requirements claiming that such measures cut down on voter fraud. However, election experts have shown that cases of election fraud are rare.

The New York Times reported that Wisconsin Democrats have opposed adding the voter ID requirement to the state constitution. Opponents of the referendum argue that such a requirement will disenfranchise students, older residents and people of color from voting. The Brennan Center for Justice found that Black voters are less likely to carry photo identification with them than white voters.

The new constitutional amendment specifies that voters must present “valid photographic identification” but does not specify what forms of identification can be used, the Associated Press reported. The constitutional amendment leaves that decision up to lawmakers.

Under the existing state law, voters were permitted to use a driver’s license, state ID, military identification card, a U.S. passport, student ID or a photo ID from a federally recognized Indian tribe in Wisconsin as valid forms of identification when voting.