At issue is whether states have any authority to step in to enforce immigration matters or whether that is the exclusive role of the federal government. In dry legal terms, this constitutional question is known as preemption.
Federal courts have blocked four key parts of the state's Support Our Law Enforcement and Safe Neighborhoods Act, known as SB 1070. Arizona will tell the high court that illegal immigration is creating financial hardships and safety concerns for its residents, and that the federal government has long failed to control the problem.
The administration plans to counter that by saying immigration issues are under its exclusive authority and state "interference" would only make matters worse.
The Southwest state is the nation's most heavily traveled corridor for illegal immigration and smuggling.
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