[T]he national defense strategy of the United States is built on the unstated assumption that the American people will not allow a lunatic to become president... Compelling evidence suggests that [Donald Trump’s] countless sins and defects are rooted in mental instability, pathological narcissism, and profound moral and cognitive impairment… Donald Trump … is a clear and continuing danger to the United States, and it does not seem likely that our country would be able to emerge whole from four more years of his misrule.