Why is this question even being asked? What if there is a small window in which we need to counterattack an enemy attack and going through Congress would have detrimental effects on our homeland? Why should our enemies have such an advantage over us?
And no...President Trump is not a loose cannon. He goes above and beyond to keep peace in this world. He recently refused to retaliate against a downed US drone by Iran because 150 people would have been killed. Doesn’t sound like a loose cannon to me! I think everyone knows that the USA is not expected to execute a first strike on anyone, which is an act of war, without going through congress first.
Did Ted Lie-to-you recently have lunch with Obama or something?