On Friday afternoon, around the same time a delegation of senior Canadian officials was preparing to meet with President Donald’s Trump’s border czar in a bid to stave off withering new tariffs, Trump himself essentially told them from afar: Don’t bother.

Mexico and Canada responded to the U.S. trade action with a 25% tariff against $155 billion worth of American goods as trade war kicks off next week.

Mexico has been preparing possible retaliatory tariffs on imports from the U.S., ranging from 5% to 20%, on pork, cheese, fresh produce, manufactured steel and aluminum, according