Brazil central bank’s strategy to keep interest rates high for a prolonged period will be put to the test by the 50% tariffs Donald Trump is expected to slap on the country as soon as this week.

The White House cited national security concerns for its tariff on copper, and Trump asked for restrictions on the export of copper scrap.

President Donald Trump signed an executive order Wednesday to impose his threatened 50% tariffs on Brazil, setting a legal rationale that Brazil’s policies and criminal prosecution of former President Jair Bolsonaro constitute an economic emergency under a 1977 law.