Jair Bolsonaro, then a congressman, and his son, Flávio, who filmed an interview in Rio de Janeiro on March 14, 2016, in which Bolsonaro said he would “eat an Indian.” Flávio Bolsonaro plans to challenge Luiz Inácio Lula da Silva, Brazil’s leftist president, at the polls in October. (Mauricio Lima for The New York Times) By ANA IONOVA The meeting between President Donald Trump and a son of his jailed Brazilian ally, former president Jair Bolsonaro, lasted just a few minutes. Still, it was…