Donald Trump’s disordered personality his unhealthy patterns of thinking, functioning, and behaving has become the defining characteristic of his presidency. It manifests itself in multiple ways: his extreme narcissism; his addiction to lying about things large and small, including his finances and bullying and silencing those who could expose them; his detachment from reality, including denying things he said even when there is video evidence to the contrary; his affinity for conspiracy theories; his demand for total loyalty from others while showing none to others; and his self-aggrandizement and petty cheating.