He is only saying that to garner the votes of those of us who would not hesitate to make Iran a glass parking lot...trust me, he knows that is not a viable military strategy because of the collateral and lasting damage that nuking ISIS would result...but it is also an absolute message to ISIS that you are toast when I become President. Clever message....
I think he’s serious when he sees nothing is off the table and that is the way it should be. ISIS or any other enemy would have to justify their use of course but it’s all on the table. as it should be.