The measure still must pass the Senate to force a showdown with the president. And it risks opening up several questions related to the Constitution's separation of powers between executive and legislative branches.
But the bill may have a greater symbolic than legal effect.
Obama explicitly has ruled out sending combat troops to help Iraq fight extremist insurgents.
Nevertheless, Republican and Democratic lawmakers say they need to reassert what they argue is their constitutional control over authorizing military force.
More than 800 U.S. forces are in Iraq. More than half are providing security for the embassy and U.S. personnel.
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