American democracy is not in imminent danger of collapse. If ordinary circumstances prevail, our institutions will most likely muddle through a Trump presidency. It is less clear, however, how democracy would fare in a crisis. In the event of a war, a major terrorist attack or large-scale riots or protests — all of which are entirely possible — a president with authoritarian tendencies and institutions that have come unmoored could pose a serious threat to American democracy. We must be vigilant. The warning signs are real.Is Donald Trump a Threat to Democracy?