Pro-Lula online campaign prompts WhatsApp response from Flávio Bolsonaro allies

Both campaigns are using WhatsApp to reach voters before the second round.

A pro-Lula channel grew sharply after the first round, and Flávio Bolsonaro’s allies say it is hard to track how messages spread there.

His campaign is urging supporters to join its own WhatsApp group and has asked the election court to act against groups it accuses of spreading false or misleading content.

The dispute matters because voters may see political claims in private messages that are difficult to monitor.