Well, as a person, he was extremely vulnerable to manipulation. And that became a problem for him as a president.
And what I mean by that is, he had a very fragile ego, and he was very susceptible to flattery, as well as taking massive offense, as we all saw, to any kind of criticism. So, on a personal level, that was also a pretty dangerous flaw.
When you’re the president of the United States, it becomes a fatal flaw, because President Trump couldn’t disassociate or disentangle himself from many of the issues that were the critical ones to address. So, when people were concerned about Russian influence in the United States election, he only thought about how that affected him, for example.
When people talked about the changes in the U.S. economic structure, he would always think, first of all, about how that might affect him and about how that might affect how people would vote for him. So, as a president, he was uniquely preoccupied with himself, not with the country.
And that, of course, made all of the problems of intelligence risks even higher, because the Russians or others from the outside could also manipulate those tendencies.