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.

Trump cast his announcement as a pressure tactic to help Bolsonaro, who is on trial for allegedly plotting a coup to overturn his loss in the 2022 presidential election.