US President Donald Trump has said he will restore tariffs on steel and aluminium imports from Brazil and Argentina.
He suggested the countries’ weak currencies and cheap exports were harming US farmers.
“Brazil and Argentina have been presiding over a massive devaluation of their currencies,” Mr Trump said.
Brazil’s President Jair Bolsonaro said he would seek talks with Mr Trump.
“Their economy is not comparable with ours, it’s many times bigger. I don’t see this as retaliation,” Mr Bolsonaro said in a radio interview with Brazil’s Radio Itatiaia.
“I’m going to call him so that he doesn’t penalise us. Our economy basically comes from commodities, it’s what we’ve got,” he said.
Argentine production minister Dante Sica said he would also request a conversation with his US counterparts.