Maybe this is what Monty is saying (in a more precise and technical language than me) but here is my HOT TAKE.

Seamus,

The Office of the President of the United States is pre-eminently a place of moral leadership than it is an administrative job, so said FDR (can't find the source of this quote however).

If for no other reason, presidents must be held accountable in the court of law so that the American people may examine for themselves in excruciating detail the character of the men who represent the soul of America 4 years at a time.
We cannot say that we know a candidate by the time he enters office, just as we cannot say we know our co-workers after their job interviews.

If we insist on a presidential wall that codifies "I will do what I can, and let the fallout judge me once I am gone." Then we insist on an American soul of expediency and might makes right. No Republic will survive long with such a tainted culture.

We may be reluctant to allow the potential abuse of the legal system in order that we may pick out the repugnant along with the politically weak...but I think the exercise of the rule of law regardless of the intent of its players is preferable to the creation of a bubble in which law is non-existent.