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Effective response to and rapid and reliable detection of infectious disease outbreaks require successful coordination of countries' border policies early on. As threats from diseases are highly salient to the public, researchers agree that a better understanding of domestic politics is crucial. This article investigates a key piece of this question: public demands for border closures. Our experiments in the United Kingdom and the United States show that a greater pandemic threat mildly increases support for border closures, but the World Health Organization's (WHO) guidance against border closures and reminders about international legal obligations to follow the guidance substantially weaken support for border closures. However, during the COVID‐19 pandemic, many countries flouted WHO's recommendations and restricted their borders. Examining media attention suggests people's lack of knowledge of the WHO guidance as a crucial reason for those border closures. Our study produces insights into the design of effective global health governance. [ABSTRACT FROM AUTHOR]