The Sao Paulo stock exchange rose more than four percent Tuesday ahead of a likely decision by the Senate to open an impeachment trial against President Dilma Rousseff.

After a chaotic Monday in which it was unclear whether the Senate vote would go ahead, the overwhelmingly anti-Rousseff markets have "returned to that scenario in which Rousseff's replacement is almost a sure thing," Jason Vieira, the chief economist at Infinity Asset Management in Sao Paulo, told Bloomberg News.