Lula and Flávio Bolsonaro trade attacks in first Brazilian runoff debate

Brazil's presidential runoff brought President Luiz Inácio Lula da Silva and Senator Flávio Bolsonaro into their first direct debate on October 18. They had not faced each other in a first-round debate, according to BBC Brasil.

Bolsonaro had finished ahead of Lula in the first round, La Nacion reported. But polling before the runoff suggested neither candidate had secured a decisive advantage.

Security was already a central campaign issue. Lula hardened his position by proposing a lower age of criminal responsibility for serious crimes, alongside promises of new economic measures, according to Perfil.com.

On October 16, CNN Brasil reported that the Tribunal Superior Eleitoral had failed to secure a truce between the campaigns. A meeting convened by minister Kassio Nunes Marques with their legal teams ended without agreement.

On October 17, Perfil.com reported a Datafolha poll showing Bolsonaro on 51 percent and Lula on 49 percent, describing the result as a technical tie. The outlet said the gap had been four to five points a week earlier.

The campaigns also pushed to turn support into votes. Lula asked supporters in Minas Gerais to mobilize undecided voters, Infobae reported on October 17. That day, Bolsonaro supporters held a procession involving cars, motorcycles and boats in Brasília, according to CNN Brasil.

Before the October 18 debate, Bolsonaro promised to confront Lula with accusations of crimes against Brazil, Infobae reported. The remarks signalled the combative approach he intended to take into the studio.

The Band debate that evening brought corruption accusations, arguments over insecurity and personal clashes, according to Perfil.com. In one exchange reported by CNN Brasil, Bolsonaro asked Lula to move closer; Lula responded that he wanted distance from a militiaman, while Bolsonaro countered with a remark about having his wallet stolen. These were personal taunts, not established findings of wrongdoing.

The confrontation also reached foreign relations. Deutsche Welle reported that the candidates sparred over Bolsonaro's ties to US President Donald Trump.

The debate ended with a week remaining before the October 25 vote. The supplied coverage establishes a bitter confrontation, but does not establish that either candidate gained electoral support from it.

Recent polls differ on who leads. Datafolha and Quaest put Bolsonaro ahead, while a Vox Brasil survey gave Lula the advantage, according to Perfil.com. Those findings do not identify a consistent leader across the surveys.

Political scientists interviewed by BBC Brasil criticised the debate format while assessing the candidates' performances. That assessment is separate from evidence of how voters responded.

The next decisive event is the October 25 runoff, the date reported by Al Jazeera. With surveys pointing in different directions, the central open question is whether either campaign can convert the final week's campaigning into a winning margin.

Lula's appeal to mobilise undecided voters, reported by Infobae, gives a concrete focus for his closing campaign. Whether the debate's attacks persuaded those voters remains unanswered in the available coverage.