That's my point.
Obama has, unilaterally, sided with the Saudi's and Gulf Arab states in the ouster of Assad.
Obama has not sought or received authorization from the US Congress for this policy, nor the means by which to carry it out.
He would not receive such authorization.
I think he's gotten plenty of support from Congress on his plan to replace secular leaders with radicals in the region, it just hasn't been made public. Most in Congress share Obama's vision of the destruction of Israel, as do most liberals in general. Most liberals also despise Christians, and they see the rise of the Caliphate as a move forward in their progressive world.