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.

Tensions between the United States and Brazil have suddenly burst open. Responding to criticism from President Trump, Brazil’s president said: “We don’t want an emperor.”

The U.S. will charge a 50% tariff on Brazilian goods starting on Aug. 1, President Trump announced in a letter to the Latin American country’s government on Wednesday, citing legal action against its former President Jair Bolsonaro and U.S. tech firms as justification for the levies.