As if a once-in-a-century pandemic, months of rioting, and a late Supreme Court vacancy weren’t enough to process in 2020, President Trump’s COVID-19 diagnosis has thrown the presidential race into the deep unknown exactly a month before voters make their decision.

We wish Trump and first lady Melania Trump well. We hope that the symptoms will not become severe and that they will make as swift recovery as possible. But this late-breaking news has wide-ranging political consequences. Some, such as the lurking question of whether the president will be sick or well on Election Day, are obvious, but it’s hard even to guess what others may be.