By passing a lie detector test?
Discussion is locked
literally, but you could have.
Anyway, a strict constructionist could point out that the Pledge applies only to "the flag and to the country for which it stands". No mention of human titles, much less personal names. Yet, in practical terms you're self-obligated to obey the Chief Executive and CinC - even if he is "the Mayor of Crazytown". [©Film, Series of Unfortunate Events]
If, at crunch time, you opt not to, you'll end up in jail with us. At least we'll understand why.
"Commentary: The unnamed insiders who claim to be working clandestinely to resist Trump are not heroes, says Peter Van Buren, a State Department veteran. “No one should join the government to do only things they think are personally right; one serves the United States, and takes an oath to a Constitution."