State Department adviser David Satterfield is quoted in the Iraqi press as saying the United States not only isn’t exploring an extension, they would reject the extension of the UN mandate and would withdraw all troops from Iraq if the Iraqis don’t approve the SOFA.
What if the Iraqi government says, relative to the withdrawal, "Fine, leave, and don't let the door hit you on the way out!"?!?
The logistics and time needed preclude an immediate US military withdrawal: Satterfield and Al Maliki understand that.
Satterfield is bluffing here, and it's really bad diplomatic form in terms of trying to ram the SOFA down the throats of the Iraqi government.