The US presidential election is taking place on November 5. But many Americans are participating in early voting by sending their ballots in by mail. In 2020, three quarters of people voted ahead of Election Day. In the crucial swing state of Pennsylvania, election workers are under pressure and some are even facing threats. Our correspondents Jessica Le Masurier and Fanny Chauvin report from Luzerne County, where local officials are on the front lines of a contentious election, with some Republicans already making accusations of fraud.