You seem to have in mind a specific legal prohibition. None comes to my mind, other than the obvious standards of good taste
which obviously don't apply to the Trump administration.
- piffle -
Government can do all sorts of things the rest of us can't.
Police cars can exceed posted speed limits, run red lights, etc.
Government can incarcerate. We can't.
Government can tax. Don't even think about it.
It would be nice to live in a world where there were no bad guys worthy of 25 to life sentences, or worse. BUT ! ...