As a librairan surely you have heard of
Essay Concerning Human Understanding by John Locke (1690)
argumentum ad verecundiam being what you tried to use, or in this case more directly a argument from false authority claiming djt is an authority in the a field that he has never been in much less succeed at that being governance.
Much like saying a hall of fame pitcher could correctly work on a C++ program because he was great at being a pitcher.
One thing I have learned in my 30+ years as a librarian, is that politicians do not understand government; they only understand how to get re-elected.
Mr. Trump understands government.