>...decided on his own to strike without congress.
The US defense establishment has been looking to attack Iran for decades. "Decided on his own", seems inaccurate in this regard. The outrage over unauthorized uses of military force is largely performative partisan outrage. Although I would personally regard it as unconstitutional, it is the established norm for US Presidents to order airstrikes. There are very few politicians who have been consistent in their opposition to this.
There's always been an authorization for military force even if it's a blanket one and they claim they're fighting ISIS, at least there has been deniability. Here there's no authorization, it's unconstitutional. I don't care about partisan politics. Most politicians are scummy.
However aside from a few consistent non-interventionists, opposing partisans seem to uniformly be using this as yet another opportunity to attack. So even there it hasn't served to appease all of the interventionists.