Arizona governor signs controversial immigration enforcement bill

With hundreds of protesters outside the state Capitol shouting that the bill would lead to civil rights abuses, Brewer said critics were "overreacting" and that she wouldn't tolerate racial profiling.

"We in Arizona have been more than patient waiting for Washington to act," Brewer said after signing the law. "But decades of inaction and misguided policy have created a dangerous and unacceptable situation."

Earlier Friday, Obama called the Arizona bill "misguided" and instructed the Justice Department to examine it to see if it's legal. He also said the federal government must enact immigration reform at the national level - or leave the door open to "irresponsibility by others."

"That includes, for example, the recent efforts in Arizona, which threaten to undermine basic notions of fairness that we cherish as Americans, as well as the trust between police and their communities that is so crucial to keeping us safe," Obama said.

The legislation, sent to the Republican governor by the GOP-led Legislature, makes it a crime under state law to be in the country illegally. It also requires local police officers to question people about their immigration status if there is reason to suspect they are illegal immigrants; allows lawsuits against government agencies that hinder enforcement of immigration laws; and makes it illegal to hire illegal immigrants for day labor or knowingly transport them.