Dilma Rousseff protests
Millions of Brazilians are publicly protesting for the president's impeachment.
Dozens of opposition lawmakers also interrupted a session of Congress to call for the president's resignation.
Polling firm Datafolha estimated 500,000 demonstrators in Sao Paulo on Sunday, the biggest rally in the city's history.
Rousseff herself has not been accused of wrongdoing in the corruption probe, but many blame her for lax oversight of Petrobras