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.

Canada faces a 35 percent tariff on its exports to the United States if it does not reach a trade deal with the Trump administration by Friday.

U.S. President Donald Trump intensified his trade war with Canada a day ahead of his August 1 deadline for a tariff agreement, saying it would be "very hard" to make a deal with Canada after it gave its support to Palestinian statehood.