Tarcísio de Freitas, governor of São Paulo state and a former infrastructure minister under Bolsonaro, told reporters Thursday that the U.S. tariffs would have a negative impact on the economy and for important industrial exporters from his state, including Brazilian plane maker Embraer.

The United States and Brazil appeared to have launched a sudden trade war on Wednesday.

The U.S. President in July posted a message on his social media platform that "Brazil is doing a terrible thing on their treatment" of Bolsonaro, and echoed arguments he made about his own legal trou...