One of the biggest election-integrity battles in the country is officially headed to the Supreme Court.
The Republican National Committee is taking its fight to defend Arizona's proof-of-citizenship requirements all the way to the nation's highest court, setting up a potentially landmark ruling over a question that sounds almost absurdly basic:
Can a state require people registering to vote to prove they are American citizens?
RNC Chairman Joe Gruters announced Sunday that the organization will argue the Arizona case before the Supreme Court this fall.
“At stake is a principle so basic that most Americans would be shocked it is even being debated: Can states verify citizenship before someone is added to their voter rolls?” Gruters wrote.
“The answer should be obvious.”
It is obvious. Federal law already makes it unlawful for noncitizens to vote in federal elections. Arizona's position is essentially that if citizenship is a legal qualification for voting, election officials should be allowed to verify that qualification before placing someone on the voter rolls.
The legal fight has been brewing for more than two decades. Arizona voters overwhelmingly approved Proposition 200 in 2004, requiring applicants to provide documentary proof of citizenship when registering to vote. The measure received roughly 56 percent of the vote.
But Arizona's election system became complicated after the Supreme Court's 2013 decision in Arizona v. Inter Tribal Council of Arizona, which held that the federal National Voter Registration Act prevented Arizona from requiring documentary proof of citizenship from applicants using the federal voter-registration form.
That produced Arizona's unusual two-track registration system. People who satisfy Arizona's proof-of-citizenship requirement can register as “full-ballot” voters, while applicants using the federal form who do not provide documentary proof can be registered as “federal-only” voters and participate in federal races.
Arizona Republicans later attempted to strengthen the state's citizenship-verification requirements through H.B. 2492 in 2022. And that kicked off another round of lawsuits.
The Democratic National Committee and voting-rights groups challenged key provisions of the law, including requirements involving documentary proof of citizenship and procedures for handling voters whose citizenship status could not be confirmed.
These shameless activist groups have the nerve to argue that demanding voters prove they have the right to vote in elections is a form of “voter suppression.”
They may have a point: It is illegal voter suppression.
Now the RNC is asking the Supreme Court to settle a major part of the dispute.
“The Supreme Court must now decide whether states have the authority to enforce one of the most fundamental qualifications for voting: American citizenship,” Gruters wrote.
“The RNC is leading the legal battle to defend Arizona’s proof-of-citizenship requirement after Democrats went to court to block the law and prevent the state from removing noncitizens from its voter rolls.”
The implications go far beyond Arizona. If the Supreme Court provides states greater latitude to verify citizenship when registering voters, the ruling could establish important parameters for election-integrity laws around the country at a time when citizenship verification has become one of the hottest issues in American elections.
And the case comes at a pivotal moment in the fight for election integrity.
As my RedState colleague Susie Moore reported, the Supreme Court handed the Trump administration another significant election-integrity victory just last week in Trump v. California.
The Court stayed a lower-court injunction that had prevented portions of President Trump's election-integrity executive order from being implemented against 23 states and the District of Columbia ahead of the 2026 midterms.
Among other things, Trump's order directed the Department of Homeland Security to provide states with citizenship information involving voting-age residents. It also instructed the Justice Department to prioritize enforcement of existing federal election laws and directed the Postal Service to develop new procedures regarding mail-in ballots.
The Supreme Court's ruling did not decide whether those policies are ultimately lawful. Instead, the majority concluded that the states' challenge was premature because much of their supposed injury depended on events that had not yet occurred.
As the Court put it, “Article III prohibits federal courts from stacking hypothetical on hypothetical to speculate that harm will eventually materialize.”
The three liberal justices dissented. But the legal drama didn't end there.
As RedState's Teri Christoph reported, U.S. District Judge Indira Talwani — an Obama appointee — subsequently issued a 14-day temporary restraining order blocking portions of the Postal Service's newly finalized mail-ballot rule.
That legal head-scratcher produced some whiplash. The Supreme Court had essentially concluded that the earlier challenge came too soon because the Postal Service hadn't finalized its rule. Once USPS finalized the rule, the Democrat-led states returned to court with a new challenge to the policy itself.
All of this is unfolding with the midterm elections just months away.
But the Arizona case goes to an even more fundamental question than mail-ballot procedures: Who is legally entitled to vote in American elections?
Congressional Republicans have pursued the SAVE America Act, while the Trump administration has sought to make federal citizenship information more readily available to state election officials. The RNC says it is now involved in more than 170 election-integrity lawsuits around the country.
As the SAVE Act sits on Senate Majority Leader John Thune’s desk collecting dust, the Arizona case could become the centerpiece of that campaign.
It also arrives amid a broader series of disputes over basic voter-verification requirements.
As we previously noted at RedState, the 5th Circuit recently restored several provisions of Texas's election law, including mail-ballot identification requirements.
A unanimous panel concluded that challengers lacked standing to attack several of the provisions, while noting that mail-in ballot rejection rates had fallen substantially after the new ID requirements. Imagine that.
Meanwhile, Minnesota has drawn fire for its indefensible election practices.
Training materials for election judges explicitly instruct workers not to request identification from registered voters. Minnesota also allows a registered voter to “vouch” for the residence of up to eight Election Day registrants. This mind-boggling system has been exploited relentlessly by radical activists, according to credible reports.
That goes to the heart of the Arizona fight. Election-integrity advocates aren't demanding some impossibly complicated system. They want election standards like you see in nearly 200 countries around the globe: voter IDs, accurate voter rolls, paper ballots, expedient counting, single election days.
It’s not rocket surgery.
Proving citizenship to vote in a national election is about as fundamental as it gets.
Now the Supreme Court will have an opportunity to uphold the basic election safeguard of requiring voter IDs, which is based not only on federal statute, but on many state laws.
Such as the law in Arizona that the Democrat Party is fighting tooth and nail to stop.
“States should not be forced to ignore evidence that registrants may be ineligible,” Gruters wrote. “Election officials should not be prevented from verifying citizenship.”
With the midterms approaching and election law already producing one Supreme Court showdown after another, Arizona's case could be bigger than a fight over one state's voter-registration rules.
It could help determine just how far states can go to answer one of the most elementary questions in any American election: Are you a citizen?