On May 3, 2011, the American Civil Liberties Union (ACLU) and the National Immigration Law Center (NILC) filed a lawsuit challenging a Utah immigration law that was modeled on Arizona's controversial SB 1070. The law requires police to check the immigration status of anyone arrested for a felony or misdemeanor and was signed into law by Governor Gary Herbert in March 2011. The challenge to the law claims that it unconstitutionally interferes with federal powers over immigration enforcement pursuant to the Supremacy Clause of the US Constitution. Other newly adopted state immigration laws have also sparked legal challenges in various federal courts over the past year. The US Supreme Court heard oral arguments in the federal government's challenge to SB 1070 on April 25, 2012.

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