Brazil's President Luiz Inacio Lula da Silva, a defining figure of the Latin American left and a vocal critic of US President Donald Trump, has pulled off a dramatic comeback victory against right-wing senator Flavio Bolsonaro, son of former far-right president Jair Bolsonaro, who trounced him in the first round. Lula received 51.8 per cent of valid votes against Bolsonaro's 48.