That interpretation would render the Constitution meaningless and make the president a dictator with the U.S. military as little more than his own private army.
when was the last time congress declared war? How many times has America comitted acts of war against other nations since then? This argument is as old as the Republic. The fact is, the President is Commander in Chief of the Armed Forces of the United States which gives him a degree of latitude in deploying military force globally. he can not declare war but he can certainly start wars by his actions, especially if Congress declines to reign him in. Like it or not, America elected him. When they did that, they gave him immense power- like it or not. Congress has the ability to reign that power in but do they have the will? Do I want this hand grenade throwing monkey running amok in the middle east? sure. why wouldn’t I? Kill ‘em all. Let god sort ‘em out.