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.

Trump announced a 50 percent tariff on all Brazilian goods, escalating a feud over Brazil’s prosecution of former president Jair Bolsonaro. Brazil vowed to retaliate.

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.”