Mexico hit back fast on U.S. tariffs on steel and aluminum on Thursday, targeting products from congressional districts that President Donald Trump’s Republican party is fighting to retain in November elections, Reuters reported.

Mexico said it was imposing “equivalent” tariffs, ratcheting up tensions during talks to renegotiate NAFTA ahead of the U.S. mid-term elections in November. The measures will be in place until the U.S. government drops its tariffs, Mexico’s government said.