So it is, the point is son that you can't show that it's not a "bedrock principle" of an impeachment. You aren't as "bright" as you think you are.
LOLOL
The only ones saying a principle of our criminal justice system is also applicable outside of our criminal justice system are idiots like you who claim it with zero proof.
You just say it and then believe it's true because you said it.
Still, it's a construct from our Constitution that applies to the
law. Impeachments are political procedures, not legal ones. Case in point, get convicted of a crime by our criminal justice system and you can face imprisonment. But get convicted in an impeachment trial, and you don't face imprisonment.