SAO PAULO (AP) — Brazilian presidential candidate Fernando Haddad is ending his campaign by warning voters about his opponent's proposals.

Haddad said on Saturday that violence will increase if gun laws are loosened, one of the things far-right front-runner Jair Bolsonaro has promised to do.

The left-leaning underdog for Sunday's runoff spoke during a rally in Heliopolis, Sao Paulo's biggest favela with more than 100,000 residents.

Haddad also thanked former Chief Justice Joaquim Barbosa for his endorsement, which was announced Saturday.

Barbosa, a popular anti-corruption judge who considered running for president, said Bolsonaro's candidacy scared him.

Bolsonaro, a former army captain, got the most votes in the first round of voting on Oct. 7

His campaign didn't announce plans for an event Saturday.