Hawaiian coffee farmers have a message for President Donald Trump: Steep tariffs on major exporters such as Brazil will end up hurting them, too.Hawaii at first glance might seem the obvious beneficiary of tariffs on coffee.

With Brazil’s dominance in arabica bean production, U.S. roasters have few alternatives for a different exporter.

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