ISIS does not present an imminent threat to the US. It presents a potential threat to the US.
Now, if he’s talking about our troops or huge diplomatic staff now in Iraq, then that could be seen as imminent. But, that is not a threat to the “United States of America”.
And, a word smith could argue that threatening our embassy or troops is a legal threat to the homeland, but Benghazi sort of negates such an effort at sophistry.
I think it is threat the US populace is so focused on visual imagery as a result of the electronic culture that BHO and friends know that an Iraqi version of the fall of Saigon would get even the brain numbed sensualists that make up a large part of the population to blame BHO for the burning city and mass murder they would be watching fascinated and horrified at the same time. So to save his posterior BHO will do something to try and prop up the Iraqi government. There is also the problem I alluded to of the thousands of US and western nationals working in Iraq including a good many females. You can imagine what would happen to these people if ISIS gets into Baghdad. Watching American or just western females paraded around naked and bound by the ISIS warriors would also deal a possibly fatal blow to the Mahdi's legacy. A real NEO op would be very big.and involve several thousand boots on the ground and a lot of combat and transport air assets so the stage is being set. Unfortunately the Mahdi and his handlers don't know anything about milops and take forever to agree on a course of action so things could get very messy.