Brazil's presidential candidates are facing off for a final debate ahead of Sunday's runoff election.

President Dilma Rousseff and challenger Aecio Neves are in a tight race, though the latest polls have given Rousseff a slight advantage going into the vote.

In the Friday night debate, Neves started right off by asking about a growing scandal at state-run oil giant Petrobras and a report in Veja magazine that says Rousseff knew about the kickback scheme.

Rousseff responded by saying that "the people aren't stupid" enough to believe the report. She says that she had nothing to do with the scheme and that the magazine report includes no proof of the allegations made by a black-market money dealer who is cooperating with investigators.