Barack Obama wants to fire cruise missiles at Syria. As president of the nation whose military possesses the most lethal firepower of any society in history, he obviously has the ability to start this war — his sixth major front, after Afghanistan, Iraq, Yemen, Libya and Pakistan — if he wants to. But does he have the legal right?
The answer is no. Not if the basic architecture of the U.S. Constitution, the separation of powers, remains in force. Not if the Founding Fathers' originalist intent, and their understanding of English at the time, means anything. Not if America's treaty obligations, which after ratification carry the full force of U.S. law, are more than pieces of paper.
Might makes right; the victor writes history. No doubt, in the perhaps-not-so-distant future, if the United States is formally constituted as an empire, with Syria one of its outlying provinces or a vassal state, no one will care how it went down back in 2013. Until, however, it matters a lot. Attacking Syria without legal basis would have broad implications, and not just for the Syrians who will lose their lives, limbs and sanity.