Relations between the U.S. and Brazil deteriorated after President Trump sought to halt criminal proceedings against his right-wing ally in the country, former leader Jair Bolsonaro, by imposing steep tariffs on Latin America’s biggest nation.

President Donald Trump sent out tariff letters to six smaller U.S. trading partners on Wednesday with a pledge to announce import taxes on other countries later in the day.

U.S. importers will have to bear the cost of additional tariffs on palm oil as there is no alternative to the commodity in the United States.