Brazilian President Lula da Silva vowed to trigger Brazil's reciprocity law if negotiations with the U.S. fail.

President Donald Trump announced Wednesday he planned to hit Brazil with a 50% tariff, in part because of the treatment of its former president Jair Bolsonaro, his political ally.

In a letter to President Luiz Inácio Lula da Silva of Brazil, Mr. Trump wrote that the new tariffs would take effect on Aug. 1. “The way that Brazil has treated former President Bolsonaro, a Highly Respected Leader throughout the World during his Term, including by the United States, is an international disgrace.”