The survey by IPEC taken over the three days since the first-round vote found Lula with 51% voter support against Bolsonaro's 43%, with a margin of error of two percentage points.

Brazilians head to the polls on Sunday, and the right-wing leader is expected to lose to former president Luiz Inácio Lula da Silva, which Bolsonaro has said he won't accept.

He also called for solidarity with fellow South American countries and lambasted U.S. President Donald Trump, saying his border wall plan is unacceptable and aimed at keeping out poor people.