Scholars interested in the power of the presidency often overlook the importance of a crisis. The right kind of event, however, has characteristics that create a window of opportunity for a president to exert or expand his unilateral power. Failure to explore this relationship leaves a gap in our knowledge regarding presidential power, which this article addresses. The results show foreign policy crises provide the largest window for a president to increase his authority. Economic crises and most natural disasters have little to no impact on unilateral power. Epidemic outbreaks are the exception, though compared to a foreign policy crisis, the impact is relatively small. Finally, the findings suggest a president suffering from institutional constraints or lacking in skill and will has the ability to increase his power whenever a foreign policy crisis occurs.