During the 2020 US presidential election, Arizona emerged as a pivotal state. Joe Biden won a narrow victory there, marking one of the rare occasions when this traditionally Republican state swung to the Democrats. In the aftermath of the election, while Donald Trump continued to claim victory, Arizona Republicans and the candidate's lawyers attempted to have the vote annulled in court – citing fraud and irregularities – but all these legal challenges were dismissed by the courts. Four years later, the state of Arizona remains more decisive than ever. Our reporters Valérie Defert and Pierrick Leurent followed the particularly tense campaign in Phoenix.