Lula was responding to Wednesday's threat by his US counterpart, Donald Trump, to impose a 50% import tax on Brazilian goods from 1 August. In a letter, Trump cited Brazil's treatment of former President Jair Bolsonaro as a trigger for tariff-hike.

"Any measure to unilaterally raise tariffs will be responded to in accordance with Brazil's Economic Reciprocity Law," Lula's office said in a statement. (Reporting by Ricardo Brito; Writing by Isabel Teles;