Arizona official: Challenging law is Holder's duty

Arizona's top law enforcement official has acknowledged that Attorney General Eric Holder has a duty to challenge the state's new immigration law if he thinks it's unconstitutional.

Arizona Attorney General Terry Goddard was grilled by a Democratic congressman during a House hearing Thursday about criticism of the Obama administration's challenge of Arizona's new immigration law.

Congressman Al Green of Texas asked Goddard whether Holder is duty-bound to uphold the Constitution and to challenge the law if the thinks it's unconstitutional.

Goddard responded, "If that's what he thinks, yes."