It shows that personal grudges rather than simple economics are a driving force in the U.S. leader’s use of tariffs.

Brazilian President Luiz Inácio Lula da Silva has said he is ready to match any tariffs imposed on Brazil by the United States. Lula was responding to Wednesday's threat by his US counterpart, Donald Trump,

It's showing that personal grudges rather than simple economics are a driving force in the U.S. leader’s use of tariffs.