Brazil’s president Dilma Rousseff greets the secretary general of the Organisation of American States, Luis Almagro,   at her office in Brasilia on Tuesday, in what may prove to be one of her final engagements in office. Photograph: Evaristo Sa/AFP/Getty Images

Tom Hennigan in São Paulo Brazil’s senate is set to suspend President Dilma Rousseff from office on Wednesday after a last-ditch effort by her allie(...)