He may well have not been paying attention in school! Remember by age 13, his parents sent him off to military school because he was getting to be too much for them to handle. This does sometimes happen with very intelligent boys.
My take is that he isn’t all that familiar with the Constitution and would greatly benefit from a strict constructionist crash course, asap.
This is one very intelligent man. But he’s not God. He needs lots of help, but not from the likes of Gary Cohn, Dina Powell, McMaster, etc. These creatures came on board on the advice and recommendation of the Prince and Princess.
He took an oath to support and defend the Constitution, not to “obey” illegal rulings by usurping activist judges. He took the wrong path with his response to the judges blocking his immigration EO, and now has set a precedent for honoring their illegal usurpation.
It truly is one big, fat, hot mess.
Oh I doubt that he got bad grades...the Military school wouldn't have taken him, back then, if he did. He was probably a snotty kid, at home and THAT is why they sent him to private school. He needed a strict, regimental regime, sans parents. And that worked....he flourished.
My guess is that he learned it and then quickly forgot it; that's what a lot of kids did/do; unfortunately. That's NOT really learning...it's just getting good grades for NOTHING. :-(
OTOH...I remember what I learned, to this day; I just have that kind of memory.
Yes, he took the oath of office; however, most presidents just ignore it.