Accusing Arizona of trying to "second guess" the federal government, the Justice Department on Tuesday filed a lawsuit challenging the state's immigration policy -- claiming the "invalid" law interferes with federal immigration responsibilities and "must be struck down."

In the suit, which names the state of Arizona as well as Gov. Jan Brewer as defendants, the Justice Department claims the federal government has "preeminent authority" on immigration enforcement and that the Arizona law "disrupts" that balance. It urges the U.S. District Court in Arizona to "preliminarily and permanently" prohibit the state from enforcing the law, which is scheduled to go into effect at the end of the month.

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