Officials in Mexico announced a new series of tariffs specifically targeting districts won by President Trump in the 2016 race for the White House; unveiling the taxes after the Commander-in-Chief imposed a 25% tariff on Mexican and Canadian produced steel and aluminum.

“Economy Minister Ildefonso Guajardo said the tit-for-tat measures would complicate talks between the United States, Canada and Mexico to revamp the North American Free Trade Agreement (NAFTA) that underpins trade between the neighbors,” reports Reuters.

“A trade war is when there is an escalation of conflict. In this case, it is simply a response to a first action,” Guajardo told Mexican radio. “We should stick to the clearly defined battlefield, where the response is appropriate and proportional.”

President Trump announced the expanded trade tariffs Thursday, saying both Mexico and Canada had failed to make trade concessions requested by his administration ahead of future negotiations on the North American Free Trade Agreement.