In the United States, presidential elections rely on thousands of actual people coming together to scrutinise and then certify the results. That’s what will happen next week, when polls close on the race between Donald Trump and Kamala Harris. So what would happen if they just refused to certify a result, for political reasons? In 2020, exactly this scenario played out, in an extraordinarily tense meeting room in Detroit, Michigan. In the four years since, Trump’s supporters have worked hard to try and replicate this roadblock around the country.