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President Obama had widespread support for ending the U.S. military occupation of Iraq. But the hastiness with which the withdrawal ultimately occurred, along with full relinquishment of any serious U.S. military role going forward, drew fire from Republicans last year.

Among those most critical was former Massachusetts Gov. Mitt Romney, the presumptive Republican presidential nominee, who claimed election-year politics had driven Mr. Obama into abandoning the Iraq mission in favor of winning over anti-war voters.

“President Obama’s astonishing failure to secure an orderly transition in Iraq has unnecessarily put at risk the victories that were won through the blood and sacrifice of thousands of American men and women,” Mr. Romney said after Mr. Obama’s announcement in October that U.S. troops would be gone from Iraq by the end of 2011.

His campaign did not immediately respond to requests for an updated comment Monday.

Mr. Cordesman expected little to change in U.S. policy toward Iraq, “especially in an election year.”

“This is not an area where American domestic politics lend themselves to meaningful intervention,” he said.

Mr. Foust added: “Beyond expressing condolences, I don’t think there’s a lot the United States could or should do in response to bombings. But we could provide humanitarian assistance to victims, and we could help the Iraqi government coordinate a response.”