This is the foreign policy of a cretin.
No bombs have fallen yet. These threats are merely for domestic consumption. If there is any action taken by Uncle Scam it will only be after ISIS, a.k.a. re-branded Al Qaeda, gets all the US tanks,vehicles, missiles and other heavy weapons left for them by the US trained Iraqi army back across the Syrian border. And if Uncle Scam does finally drop some bombs on ISIS they will 'accidentally' miss and land on the Syrian Army.