PHOENIX (AP) -- A referendum drive and a lawsuit have emerged as potential road blocks to Arizona's tough new law on illegal immigration that has thrust the southwestern border state into the spotlight.

The legal action set to be filed Thursday in federal court is aimed a preventing enforcement of the controversial measure, while the ballot question could put it on hold until 2012.
Signed last week by Republican Governor Jan Brewer, the law requires local and state law enforcement to question people about their immigration status if there's reason to suspect they're in the country illegally, and makes it a state crime to be in the United States illegally.

A draft of the proposed lawsuit obtained by The Associated Press shows the National Coalition of Latino Clergy and Christian Leaders will seek an injunction preventing authorities from enforcing the law. The group argues federal law pre-empts state regulation of national borders, and that Arizona's law violates due-process rights by allowing suspected illegal immigrants to be detained before they're convicted.

Other Hispanic and civil rights groups, including the American Civil Liberties Union and the Mexican American Legal Defense and Educational Fund, are also planning lawsuits. And U.S. Attorney General Eric Holder has said the federal government may challenge the law.

On Wednesday, a group filed papers to launch a referendum drive that could put the law on hold until 2012 if organizers wait until the last minute to turn in petition signatures needed to get the measure on the ballot.

Opponents of the law have until late July or early August to file the more than 76,000 signatures -- the same time the law is set to go into effect. If they get enough signatures, the law would be delayed until a vote.
But the deadline to put a question on the November ballot is July 1, and a referendum filing later than that could delay a vote on the law until 2012, officials with the Secretary of State's Office said.

"That would be a pretty big advantage" to the law's opponents, said Andrew Chavez, head of a Phoenix-based petition-circulating firm and chairman of the One Arizona referendum campaign.

The legislation's chief sponsor, Republican state Rep. Russell Pearce, said he has no doubt voters will support the new law at the ballot box, which would then protect it from repeal by the Legislature. In Arizona, measures approved by voters can only be repealed at the ballot box.

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The clergy group's lawsuit targets a provision allowing police to arrest illegal-immigrant day laborers seeking work on the street or anyone trying to hire them, according to the draft. It says the solicitation of work is protected by the U.S. Constitution.

State Rep. Ben Miranda, a Democrat who will serve as the local attorney on the case, said it was important to file the suit quickly to show local Latinos and the rest of the country that there's still a chance the law won't be enacted.

"I think there's real damage being caused right now," Miranda said. "How do you measure the kind of fear ... going on in many parts of this community?"
At least three Arizona cities -- Phoenix, Flagstaff and Tucson -- also are considering lawsuits to block the law.
The effect of the law continued to ripple beyond Arizona. A Republican Texas lawmaker said she'll introduce a similar measure similar next year, and Republicans running for governor in Colorado and Minnesota expressed support for the crackdown.

Civil rights leaders and others have called for a boycott of Arizona, and the Mexican government is warning its citizens about an "adverse political atmosphere" in Arizona. At least three Arizona cities are considering lawsuits to block the law, and there are two efforts to put a referendum on Arizona's November ballot to repeal it.
Retired South African archbishop Desmond Tutu said he supports the idea of a boycott of Arizona businesses, according to a letter he wrote that was posted Wednesday on TheCommunity.com, a website for Nobel peace laureates that promotes peace and human rights.

"I recognize that Arizona has become a widening entry point for illegal immigration from the South... but a solution that degrades innocent people, or that makes anyone with broken English a suspect, is not a solution," Tutu said.
Colombian singer Shakira planned to visit Phoenix on Thursday to meet with the city's police chief and mayor over her concerns that the law would lead to racial profiling.

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