ABC's Jake Tapper reports:

Obama administration sources tell ABC News that Attorney General Eric Holder is expected to file a lawsuit against the state of Arizona for its immigration law, likely next week.

The suit has been expected for some time now. Secretary of State Hillary Clinton told a South American television interviewer that the president had told the Justice Department to file the suit on the basis that it's the constitutional responsibility of the federal government -- not states -- to set immigration policy.

I'm a little surprised they're actually going through with this. Previous state immigration laws have been upheld, so it doesn't seem like there could be much to the substance of Obama administration's complaint. The law is very popular in Arizona and across the country. And, as Byron York writes today, Obama has enough real crises on his hands already that you wouldn't think he'd want to attack Arizona right now. But there he goes again.

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