"The Constitution is clear that only Congress can declare war and only the president can wage it. Federal law and international treaties provide that — short of defending the country against an actual attack — without a congressional declaration of war, the president can only constitutionally use military force to repel an enemy whose attack on America is imminent or to defend U.S. citizens and property in foreign lands from foreign attack or in aid of an ally pursuant to a treaty with that ally.
In the case of Trump's bombing Syria earlier this month, none of those conditions was met."
Read the rest at; http://www.judgenap.com/post/war-and-the-separation-of-powers