This Saturday, thousands of people are expected to gather inside the BOK Center in Tulsa, Oklahoma, a city where Covid-19 cases have risen steeply since May 31, at a rally for President Donald Trump's reelection campaign. There may not be room for physical distancing in the arena, which can hold 19,000 people. Each person who registered has signed a waiver to say they will not sue Trump if they get sick with Covid-19.