Leftist leaders in Caracas, Quito, La Paz and San Salvador have been consistent allies of Rousseff and her predecessor, Luiz Inacio Lula da Silva, including Venezuelan President Nicolas Maduro, who said the U.S. was behind the impeachment push.
Rousseff was convicted of bypassing Congress to alter budgets by decree and taking too long to reimburse state-controlled banks for funds used to pay for government programs, a delay that her opponents say amounted to taking out illegal loans from those institutions.
Brazil's Senate overwhelmingly in the final phase of her impeachment trial voted on Wednesday to remove President Dilma Rousseff from office on charges of breaking budget laws.
Temer, 75, was sworn in shortly after a majority of senators voted Wednesday in a highly charged session to remove the leftist Rousseff, 68, on grounds that she illegally manipulated the state budget.
Cheers - and cries of disappointment - erupted in the blue-carpeted, circular Senate chamber as the verdict flashed up on the electronic voting screen.
The statement argues that the political process against her violates democracy and Brazil's constitution. But recently he has come out of the shadows by ending the Rousseff presidency and beginning a new era in Brazil.
Better known as a backroom wheeler-dealer than street politician, Temer took over in an interim role after Rousseff s initial suspension in May.
In the center of the capital, extra security and the closing of avenues near the Senate caused massive traffic jams. Local media have reported that at least 52 senators have said they will vote for ouster, while roughly 18 are opposed and 11 have not said.
On August 9, as Brazil hosted the Olympic Games, the Senate voted to formally open an impeachment trial. "Do not accept a coup". Rousseff's reign over the corrupt country lasted one year and eight months.
"It began because 90% of the population has said loudly, no more (Workers' Party)", he said.
(AP Photo/Silvia Izquierdo). Demonstrators shout slogans against Brazil's President Michel Temer as they hold signs that reads "Temer out" and "Coup Leader" during a march in Rio de Janeiro, Brazil, Wednesday, Aug. 31, 2016. Temer has promised to pull the country of 200 million people from its recession by tackling reforms that have always been taboo, such as slimming public pensions.
About 50 leftist demonstrators gathered outside the presidential palace to show their support for Ms Rousseff.
In June 2015, Brazil tipped into its worst recession in decades.
Paschoal then broke into tears as she asked for Rousseff's forgiveness for making the president suffer.
Those things add to vehement opposition from Rousseff and her backers, who brand him a "usurper" and say he was brought into office to help squelch the corruption probe and restore the authority the country's elite.
Much of the grim news snowballed over the a year ago while Congress was consumed by the fight over President Dilma Rousseff's future. "It is against us", Maduro said in a televised speech. "History will treat her fairly".
"Putschist is you", he said, referring to Rousseff.