Brazil's Senate will open the impeachment trial of suspended President Dilma Rousseff on Thursday and hear witnesses for and against the leftist leader who is expected to be removed from office next week on charges of breaking budget laws.
Rousseff, Brazil's first female president, will appear before the 81 senators on Monday to defend herself, but her opponents are confident they have more than the 54 votes needed to convict her.
The final vote expected on late Tuesday or the early hours of Wednesday would confirm her Vice President Michel Temer as Brazil's new leader for the rest of her term through 2018, ending 13 years of leftwing Workers Party (PT) rule.
A poll published by O Globo newspaper on Thursday showed that 51 senators were committed to voting to dismiss Rousseff, with only 19 supporting her and 11 undecided.
Temer's right-leaning government held last minute talks with senators and political parties to shore up votes against Rousseff, who has denied any wrongdoing and described efforts to oust her as a 'coup'.
Temer aides said they expect at least 60 senators to vote against Rousseff.
If he is confirmed president by Rousseff's ouster, Temer would face a daunting task to steer Latin America's largest economy out of its worst recession since the Great Depression and plug a budget deficit that topped 10 percent of gross domestic product (GDP).
Rousseff is charged with spending without Congressional approval and manipulating government accounts to disguise the extent of the deficit in the run-up to her 2014 re-election.
Financial markets have rallied on prospects of a more market friendly government, with the real currency rising around 30 percent against the dollar this year. Still, investors and members of Temer's fragile coalition are concerned he has yet to unveil measures to drastically curb the deficit.
A draft budget for next year is not expected in Congress until August 31, after the Senate vote, by which time Temer could have more political leverage to push through unpopular austerity measures.
Temer's team has sought to speed up the trial so he can set about restoring confidence in a once-booming economy and remove any doubts about his legitimacy as Brazil's president.
If Rousseff is removed, Temer must be sworn in by the Senate. He is then expected to address the nation before heading to the summit of the G20 group of leading economies in Hangzhou, China on September 4-5 on his first trip abroad.
In her last rally before the trial, in the auditorium of a bank workers union in Brasilia on Wednesday night, Rousseff supporters chanted "Out with Temer."
Rousseff, who once belonged to a left-wing guerrilla group, said she has refused to resign to make the point that she is being ousted illegally.
"I committed no crime. To stop this happening again, I must go to the Senate to defend Brazil's democracy, the political views that I advocate and the legitimate rights of the Brazilian people," she said.
Yet even Rousseff's Workers Party, hurt by corruption scandals and her dismal economic record, has distanced itself from her last-minute call for new elections to resolve Brazil's political crisis.
A sign that Rousseff is not expecting a favorable verdict next week is that she has begun to move her personal belongings out of the presidential residence in Brasilia to her home in Porto Alegre.