It cannot be "unapproved by Congress".<p>A US president does not have authority to start a war, Congress has, according to Constitution. The president only serves as a Commander in Chief.<p>So at any point Congress can stop any military action issuing an immediate ruling preventing the president doing anything. If our congressmen don't do that it means they approve it.<p>It's our, USA, war, not Trump's war. Because we elected the congressmen.