The Constitution does not contain every clause of U.S. law. It will not tell you what a Yield sign is in traffic and what to do about it. And the President of the United States, as Commander-in-Chief, is authorized, though not by direct law as codified in the Constitution, to be the Commander-in-Chief, which title is Constitutional, referring to the President, and thus be enabled to bring military action to anywhere needing its utilization for such purposes as "in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity," [Preamble to the Constitution]
Congress has not declared War since WWII, yet Presidents have lawfully engaged the Military in multiple sites around the globe since WWII with the full support of law, even if not in the Supreme law. Is this truly so difficult for this current crop of congressional Democrats to understand, because even Democrat presidents have unstop and deployed the military without necessity of congressional approval.
