President Donald Trump put Brazilian politics front-and-center Wednesday in a letter declaring a new 50% tariff on U.S. imports from the Latin American nation set to begin Aug. 1, citing mistreatment of longtime ally and former Brazilian President Jair Bolsonaro.

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

Brazil’s President forcefully rebuked Trump after the U.S. leader called the prosecution of Lula’s predecessor, Bolsonaro, a “witch hunt” and hiked tariffs on the Latin American nation.