A threat? Perhaps.
A direct threat?
Please demonstrate with suitable references that ISIS is a direct threat to the security of the US at this moment.
Do you have ANY evidence that agents of ISIS have penetrated US security and that civilian live are at risk.
And please demonstrate how, if waring against terrorists over there is the answer, you have an even greater, and more brutal threat after nearly 14 years of war, 7 of which occurred in the very country the president is attacking again.