The different views highlighted both the complexity of the crisis in Iraq,and rapidly changing alliances across the region.
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A full-fledged national debate emerged Monday on whether the United States should seek help from Iran in trying to defuse the crisis in Iraq.
Administration officials made it clear they would welcome diplomatic cooperation from Iran, even as they ruled out any joint military actions.
In Congress, allies were split over the possibility of accepting help from Iran to stop Sunni extremists from overrunning Iraq just more than three years after the end of a war that cost more than 4,000 American lives and billions of dollars.