Trump has justified tariffs on goods from Canada, the top U.S. export market, by accusing it of failing to stop the cross-border flow of fentanyl, even though U.S. government data shows Canada accounts for only 1% of the fentanyl that enters the United States.

U.S. President Donald Trump signed an executive order on Thursday increasing tariffs on Canadian goods to 35% from 25%, the White House said.

Canada, one of the U.S.’s largest trading partners, was not able to reach a deal with the White House, who instead raised tariffs on some Canadian goods. “Relationships matter,” says Former U.S. Ambassador to Canada David Cohen,