My favorite president has a lot of time now to think over and evaluate his choices and missteps. Unfortunately.
IMHO America's top apparatchiks (DOJ, CIA, DOD come to mind) are more powerful than the President or Congress. Trump (or any President) in no way had total control over these organs of Federal Power. He had to learn on the job who could be trusted, and who could not, all while trying to stay alive and move his agenda.