I'm interested in how Trump can be totally coherent in a personal, if on-the-record, conversation with Woodward and then incoherent in public forums. My thought is that in public conversation, he feels a greater need to impress. His instinct is to hyperbole to be impressive, and he's not particularly gifted at artful bullshitting. In personal moments, when he has a single interlocutor, he can focus more. This tracks with the numerous stories, even from Trump foes, that he can be quite charming in person.