In the first trading session after Lula's runoff victory, Brazil's currency dropped 12 percent against the dollar and the stock exchange halted trading for 30 minutes as the Bovespa index fell 10 percent from its previous close, triggering a circuit-breaker.

Bovespa futures tumbled nearly 15 percent, according to Al Jazeera. Donald Trump said the election in Brazil “looked more like a fraudulent election”, without presenting any evidence of irregularities.