here is my take:

• Trump doesn’t have the authority (only Congress), but thank goodness our Congress has rubber stamped away most of their Legislative checks and balance on the Executive branch over the last 6 decades.

• Thank goodness the checks and balances our Founders had envisioned don’t really exist anymore. Or at best, the checks our Founders gave on the Executive are greatly diminished, and the scales of power between the three branches they prescribed is unbalanced.

• So, Trump might just actually do it, disrupt a whole lot of shit with it, and we will have to wait for it to go through the Judiciary until the Supreme Court rules that the President doesn’t have that authority.

• Consequences:
-NATO unity is further undermined
-Our Allies’ trust in us is eroded further
-America’s enemies will continue to doubt our deterrence capability (which is what we use to run the world)