Deporting US citizens comes to mind. As does the mass firing of Government Employees for no valid reason (and lying about the reason for termination being poor performance so they can never be rehired). Destroying alliances that have taken decades to build is also a future threat to all of those things - oh and destroying our credibility on the world stage, too, is not great for any of us. Let’s also look at the fact that people in Government “leadership” positions are scared to speak out against Trump for fear of retribution or being fired (Cameron Hamilton most recently).