The U.S. Department of Justice has sued Iowa to block the state's new immigration law. It's the second court challenge filed against the new measure.

Civil rights groups filed a lawsuit on Thursday seeking to block an Iowa law authorizing the arrest and prosecution of people who have returned to the U.S. after being deported, as a growing number of Republican-led states consider similar proposals.

Civil rights and immigrant rights groups are suing Iowa over a new law that makes it a crime to be in the state if previously denied admission to the U.S. The American Civil Liberties Union of Iowa an

Allowing the measure to proceed would merely shift the battle to the electoral arena but that has its own complications.

The California Supreme Court is expected to hear arguments about whether to remove a measure from the November ballot that would make it harder for the state and local governments to raise taxes