Conspiracy theories are as old as politics. But conspiracists today have introduced something new--conspiracy without theory. And the new conspiracism has moved from the fringes to the heart of government with the election of Donald Trump. In A Lot of People Are Saying, Russell Muirhead and Nancy Rosenblum show how the new conspiracism differs from classic conspiracy theory, why so few officials speak truth to conspiracy, and what needs to be done to resist it. The new conspiracism targets democratic foundations--political parties and knowledge-producing institutions. It makes it more difficult to argue, persuade, negotiate, compromise, and even to disagree. Ultimately, it delegitimates democracy.