IMO, therein lies the problem: believing the President ‘runs’ the country.
Per the Constitution, he has a role...but a VERY limited role. Sure, the CiC is important, but (unlike some here...and, again, this is my $.02) it is not to be the world police (unless you want that New World Order along with).
He’s a smart man and, I’d presume, be open to change his mind RE: 2nd.
Not enforcing the existing Constitution and/or Laws...THAT is non-CiC material. Else, I’m not seeing what else ‘needs to be learned’ ahead of time.
Except in the case of a narcissist who works around the Constitution and is not burdened by its essential safeguards (i.e., a balance of power, AKA political opposition).