Now that Trump has chosen to strike out in a broad and highly destabilizing fashion that puts both the U.S. and our allies at serious risk, his actions will leave him more isolated and subject to greater scrutiny. The resulting pushback will be as much political as legal and thus will likely depend at least in part on the speed and efficacy with which Trump can accomplish (or abandon) his purported objectives, as well as the broader contours of how Trump manages his domestic political constituencies and the United States manages its international relations. But this is simply a reflection of the fact that in war powers, as in many areas of law that are not readily subject to clean judicial enforcement, the two are not so easily separated. It doesn’t mean that the law doesn’t matter; it just means that law isn’t the only thing that matters.