Congress has the power to declare war. The president being commander-in-chief does not mean he can do whatever he please with the U.S army as its own personal force. The president is meant to follow the constitution, even as commander. If the president ignores treaties and war declarations, I would argue the president is the one violating the separation of powers, and not congress by hypothetically enforcing the powers given to them by the constitution. By this logic, whoever controller the army should have absolute power, being commander-in-chief and all. I like how you slipped past my initial post by completely ignoring that the constitution grants congress influence over foreign policies by citing the president control over the armed forces as this unalienable right. Why have treaties then? Why have declaration of war? I think you might be slightly biased in your argument. The president was never the sole responsible for foreign policies, even though the executive branch had a lot of influence over those in recent times.