As I have been saying for several years, Trump only makes sense if you understand his extreme narcissism and his extreme ADHD. He spews forth with whatever notion is at the top of his head, and leaves it to others to clean up his mess. This not a man who either thinks strategically or is able to execute on strategies that others provide him with.
I've described more than fifty different aspects of his ADHD in medium posts 2019-2020, and explore them in more detail in my book, Recognizing Adult ADHD: What Donald Trump Can Teach Us About Attention Deficit Hyperactivity Disorder.