Lula's election victory in Brazil complicates Donald Trump's push for a right-aligned Latin America, after Trump called the vote 'rigged' while praising Lula.
Flávio Bolsonaro, beaten by Luiz Inácio Lula da Silva in Brazil's runoff, has arrived in the US after the Supreme Court ordered him to hand over his passports.
Luiz Inácio Lula da Silva takes 51.79% of the second round to win a fourth term, while Flávio Bolsonaro refuses to recognise the result and calls for annulment.
Luiz Inácio Lula da Silva wins Brazil's run-off with 51.79% to Flávio Bolsonaro's 48.21%, taking a fourth term as the defeated rival seeks to annul the vote.
Brazil's run-off pits Lula against Flávio Bolsonaro after former industrial cities like Osasco swung right, with 33 million abstentions in the first round.
Flávio Bolsonaro took 56.1m votes to Lula's 53.8m in Brazil's first round, setting up a 25 October runoff that Luiz Inácio Lula da Silva must overturn.