Maria Zamudio grew up in the shadow of S.B. 1070, the divisive Arizona immigration law passed by Republicans in 2010 that sparked years of fear and protests. Friends fled the state, fearing the immigration enforcement provisions that made it known as the “show me your papers law.” She worried her undocumented parents would be deported while she was at school.
“It took away our childhood,” said Ms. Zamudio, 24. She joined thousands of young Latinos who jumped into politics to fight the law and celebrated when it was hobbled by legal challenges. “I thought we were over this.”
But now, Republicans in Arizona believe that widespread discontent over President Biden’s performance on immigration has given them a new opening to confront unauthorized immigration — unease that would put the border crisis directly onto the ballot in November.
Republican lawmakers are pushing for a ballot measure that would make unlawfully entering Arizona from Mexico a state crime. The legislators’ proposal would give local police officers the power to arrest and jail migrants and would allow state judges to deport them. It would also make officers and other government officials immune from any resulting lawsuits.
“We have to do something,” State Senator Sonny Borrelli, the Republican majority leader, said in a fiery floor speech before a vote in May advancing the plan. “We have an invasion.”
On Tuesday, the Arizona House, also under Republican control, is expected to give the proposal final approval for the ballot. Gov. Katie Hobbs, a Democrat, has denounced the effort, but she does not have veto power to block Republicans from sending it directly to voters.
If voters pass the measure in November, it would mark a sharp U-turn for a state that has moderated its approach to immigration since an era when Sheriff Joe Arpaio of Maricopa County carried out raids and traffic stops that critics decried as racial profiling.
In recent years, Arizona voters have approved in-state tuition for undocumented students and voted against immigration hard-liners like Mr. Arpaio, who was ousted in 2016, and former President Donald J. Trump.
But Republicans say voters are ready to embrace their new crackdown because they are fed up with seeing thousands of migrants camped along the border wall and the growing death toll from fentanyl smuggled across the border.
The record migrant crossings have also angered Democratic leaders and voters in cities like New York and Chicago and have become a major re-election liability for President Biden. On Tuesday, he is expected to sign an executive order letting him close the border when crossings surge.
Opponents say the Arizona ballot measure will do nothing to improve border security or prevent asylum seekers from arriving. Instead, they say it will replicate the paranoia and turmoil Latino and immigrant communities experienced after Gov. Jan Brewer signed S.B. 1070 into law.
Politicians on both sides said they expected the proposed Arizona law to face legal challenges.
The difference in Arizona is that the fight is playing out not in a solidly red state, but in a closely divided battleground. Political experts say the immigration measure could have unpredictable ripple effects on races for president and control of the United States Senate.
Republicans are hoping the ballot measure fires up anti-immigration conservatives while motivating otherwise unenthusiastic independents — a kind of mirror image of the ballot measures protecting abortion rights that Democrats are hoping to use in states including Arizona to energize their own voters.
The Arizona immigration measure, which would need a simple majority to pass, is called the Secure the Border Act. It would also increase prison sentences for anyone who sells fentanyl that results in an overdose death and would make it a state crime for undocumented workers to provide false information to the E-Verify screening system.
“This would certainly help draw Republican voters out,” said Mark Lamb, a cowboy-hatted sheriff from a conservative county south of Phoenix who is running in the Republican Senate primary. He had concerns about the measure’s price tag but said he would ultimately vote for it.
Democratic activists said the immigration measure could backfire by stirring up a wave of opposition from Latino voters and suburban moderates worried about the damage to immigrant families and Arizona’s reputation and economy.
Arizona’s population is 32 percent Latino, and many voters still have searing memories of S.B. 1070.
On a 100-degree Saturday, dozens of Latinos opposed to the measure gathered on the lawn outside the State Capitol to trade stories about how they had lived in fear and paranoia under S.B. 1070 and had seen immigration agents at their front doors. Shading their children under parasols and olive trees, they shouted the old farmworkers’ union slogan “Sí se puede” — “Yes we can” — and urged their neighbors to start organizing to register voters and defeat the ballot measure.
“We’re dead against it,” said Nieves Riedel, the mayor of San Luis, a small Arizona city that sits directly along the border wall. She said the city’s police force was already short 57 officers and could not handle the cost and time it would take to arrest hundreds of migrants. Sheriffs and prosecutors say local courts and jails would be overwhelmed.
“There’s only so much we can do,” Ms. Riedel said. “Our policemen and women are not federal agents. They’re not trained. What’s going to happen to our safety and security if they’re acting like Border Patrol agents?”
Mark Dannels, the sheriff of conservative Cochise County, has been one of Mr. Biden’s staunchest critics along the border, but he said the border security ballot measure would amount to little more than a giant new job for his officers without providing new funding.
“How the heck are we going to do this?” he said. “We don’t have the budget. We don’t have the resources.”
But conservative border ranchers like Fred Davis said Arizona had to do something. He often sees law enforcement officers chasing suspected human traffickers down the highway that bisects his ranch near Tombstone, and he regularly calls the Border Patrol to report migrants emerging from desert washes and thick brush near his property.
Republican lawmakers say the proposed law would allow the local sheriff to charge migrants like those with illegal entry — a misdemeanor for a first offense and a felony punishable by years in prison for anyone already convicted of entering illegally.
“Given the lack of control of the border, I just feel it’s something the state has to resolve,” said State Senator Ken Bennett, a Republican who voted for the measure.
He said the law was narrowly focused on border enforcement and would require the police to witness someone crossing the border or have a recording to make an arrest.
“That’s not stopping someone hundreds of miles inside the inner parts of the state,” Mr. Bennett said. “You got to see them with your own eyes or have technological evidence.”
But immigrant-rights activists said another line in the law allowing “any other constitutionally sufficient” probable cause would give law enforcement officers free rein to arrest unauthorized immigrants anywhere in Arizona.
Immigrant activists are already rallying against the measure but said they were worried it could easily pass in a state where many voters are upset about the surge in migrants.
Irayda Flores, a seafood importer in Phoenix who was born in Mexico, said she had spent years worried about losing her legal status as she fought to get permanent residency. Now, she said, she is disheartened that her immigrant employees or her son could face the same fears.
“We’re going back” to a worse time, she said. “The immigrant community, we pay taxes, we bring a lot to the table. And they treat us like criminals.”
