Brazilian President Lula da Silva vowed to trigger Brazil's reciprocity law if negotiations with the U.S. fail.

That is the highest levy announced so far in Trump’s letters to world leaders this week, and comes after he wrote a lengthy message supporting the former Brazilian leader.

President Donald Trump on Wednesday informed seven more nations about new tariffs, singling out Brazil with a 50% duty because of what he called the "disgrace" of how former President Jair Bolsonaro has been treated and an "unfair trade relationship.