Outgoing Brazilian President Jair Bolsonaro is challenging the election he lost last month to left-wing rival Luiz Inácio Lula da Silva. Bolsonaro blames a software bug and is demanding that the electoral authority annul most of the votes cast on electronic voting machines. Although Lula's victory has already been ratified by the Superior Electoral Court, Bolsonaro's claims could fuel protests from a small but committed group of his supporters.