Some time ago, Charli reviewed an article I published in International Organization. In that review, Charli asked how do we know what we ‘know’ about the nature of external states. At the time, I thought the question an important one. In only a few years, the question has gone from important to absolutely critical. As the politics surrounding Trump’s election and administration, including the now pervasive claim of ‘fake news’ demonstrate, knowledge—and faith therein—is under strain. While knowledge has never been as objective or robust as most international relations (IR) scholars assume,...