Many Democrats are wary of any U.S. military action.
Republicans, meanwhile, want to take action in the form of airstrikes, but are against cooperating with Iran. They also blame President Obama for the current crisis, saying he pulled U.S. forces out of Iraq too early.
As politicians weigh their options, I.S.I.S. fighters continue to close in on Baghdad, and have even attacked Iraq's largest oil refinery.
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