Brazilian President Luiz Inacio Lula da Silva on Thursday said he would not take orders over tariffs from a foreigner, referring to U.S. President Donald Trump, and later called the United States' threatened duty "unacceptable blackmail.

Donald Trump has proposed huge levies on Brazil, prompting an outspoken response from the CEO of Embraer, which builds vital regional airliners.

President Donald Trump took to Truth Social Thursday evening calling for an immediate end to what he called "unjust" political attacks against former Brazilian President Jair Bolsonaro.

Trump threatened a 50% tariff against Brazil, one of the U.S.’s largest suppliers of green coffee beans, starting Aug. 1.

The Trump administration launched a trade investigation against Brazil on Tuesday, just one week after blasting Brasília for its treatment of ally former President Jair Bolsonaro. The trade investigation ostensibly regards unfair trade practices.

Brazil is Florida’s biggest international trading partner for buying what the Sunshine State sells, and tariffs might make orange juice prices soar.

Trump’s move is linked to Brazil’s attempts to hold US social media companies responsible for ‘illegal content’