Brazil's tense presidential run-off campaign feels like a psychological thriller

Insults traded on social media and a combative debate have intensified the pressure ahead of a fiercely contested presidential run-off on Sunday, with only a few points separating leftist pro-union President Luiz Inacio Lula da Silva and far-right challenger Flavio Bolsonaro, the son of former president and Trump ally Jair Bolsonaro.