I've given the Pres the benefit of the doubt more than once.

He a practiced liar as a salesman who will always promote.   I've chose to accept that his statements are not 'mistakes' but in fact very intentional.  I doubt he really cares about facts which makes us claims of fake news even more hypocrticsl(not that I like broadcast news).

There more than ample evidence that he lies to persuade.  Sure it's done by others but rarely so stupidly and blatantly in front of people who will challenge him.

When he does something right, like the quick response in Syria, I try to acknowledge such things.

We all make mistakes and the President had zero work in the area of governance.  I hope he can learn.  I don't think anything will change his character.