The Mueller report will find conduct short of a conspiracy, but Don is still nervous as you can see in his comments on Fox:
“"It's always interesting to me because a deputy, that didn't get any votes, appoints a man that didn't get any votes, he's going to write a report on me. I had one of the greatest election victories in history. Would you say that's true? They came from the valleys, they came from the rivers, they came from the cities, they came from all over, they voted in one of the greatest elections in the history of our country, and now I have a man, because we have an attorney general who -- nobody can even believe he didn't tell me, but he recused himself -- so I have a man who is a deputy who I don't know, who I didn't know at all, and he appoints a man who had just left my office, I didn't give him the job at the FBI, [James] Comey's his best friend, but listen, you know it better than anybody, you've been very fair in this, but listen, I have a deputy, appoints a man to write a report on me, to make a determination on my presidency? People will not stand for it."
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But the actual story in that comment is that Don doesn’t understand that the Republic is bigger than any one President because elected officials come and go. As much as he thinks he was elected in some historic victory, he will be “unelected” too, whether in the next election or via the law.
I presume he understands at least that much and so it must just be ego