U.S. President Donald Trump threatened Brazil with 50% tariffs this month, venting his anger over the country's prosecution of his political ally, former President Jair Bolsonaro, but the move may provide ammunition to plaintiffs aiming to bring down the centerpiece of the White House's tariff agenda.

Brazilian President Luiz Inácio Lula da Silva says that his government has not been successful in trying to negotiate the 50% tariff on Brazilian imports that U.S.