Also we must have the legal authority to use what we have.
It's just my opinion, but if you've sworn an oath to preserve, protect and defend the Constitution of the United States, "legal authority" is there 'in spades.'
(Now, if you really want to lose sleep tonight, just try reading the 10th Amendment the way we all read the 2nd Amendment - the way it was written. They both mean PRECISELY what they say. They are part of the 'law of the land,' just like the 1st Amendment, or the 13th Amendment. Think about that - and then reread the 'Troublesome Tenth'... )