In February, Brazil's prosecutor-general charged the former president with staging a coup to remain in office after his loss to current President Luiz Inácio Lula da Silva in 2022.
The plot allegedly included plans to kill Lula, his vice-president Geraldo Alckmin, and Supreme Court Justice Alexandre de Moraes, who is leading the case and others against former President Bolsonaro.
His son told The Financial Times that pro-Trump lawmakers and officials are receptive to his arguments that Lula is leading Brazil into authoritarianism.
"Jair Bolsonaro is already a condemned man," Bolsonaro said in the interview. "It is very likely they will try to kill him in jail or that he'll never leave jail."