Trump’s mendacity and conspiratorial reasoning, along with his contempt for journalism, recall the attitudes of Senator Joseph McCarthy—a connection that some early Trump observers attributed to the fact that the Senator’s chief counsel in the Army-McCarthy hearings, Roy Cohn, became something of a mentor to Trump in the nineteen-seventies. Trump’s incendiary populism mirrors the tradition of reactionary populists from Senator Thomas Watson to Governor George Wallace. The aggressive xenophobia of Trump’s immigration policies shares DNA with the anti-immigration raids launched by Attorney General A. Mitchell Palmer during the Presidency of Woodrow Wilson. The point is not simply that so much of what Trump represents is unprecedented as that, where his actions have echoes from the past, they are almost universally troubling.