Trump threatens Canada tariffs over cross-border wildfire smoke

Trump the president said in a Truth Social post that he will call the prime minister and add the cost of the smoke pollution to existing tariffs on Canadian goods.

First Published: July 17, 2026, 11:36 AM ET

WASHINGTON D.C. — Donald Trump threatened to raise tariffs on Canada over wildfire smoke drifting into the United States, in a Truth Social post on July 17, 2026 at 3:24 PM ET.

Here is the full post on truthsocial: “We are holding Canada responsible for the fact that they are not properly maintaining their Forests, and Brush therein, and the United States is being unnecessarily invaded by filthy, polluted, and unhealthy air, the quality of which is dangerous, and totally unacceptable! I will call the Prime Minister during the day to find out what they are going to do about it. The cost is incalculable! Canada has refused to engage in basic Forest Management and Debris Removal, knowing that such refusal will lead to exactly this result. This is Willful Negligence, and becoming a yearly occurrence, costing the United States Billions of Dollars, which cost of this pollution must of necessity be added to the TARIFFS Canada is currently paying. Thank you for your attention to this matter! Trump”

Trump blamed Canada for what he called willful negligence on forest management and said the cost would be added to tariffs the country already pays. He said he would call the prime minister during the day. The president offered no figure for the added cost, saying only that it was incalculable and ran to billions of dollars.

The post ties an environmental grievance to trade policy, a link that would touch millions of consumers on both sides of the border. Canada ranks among the largest trading partners of the United States, and higher tariffs raise costs for American importers who buy Canadian lumber, energy and manufactured goods. The move would mark another escalation in a tariff dispute that has strained ties between the two neighbors.

Has this happened before? Cross-border smoke from Canadian wildfires has reached the United States in recent summers, and Trump has previously tied trade penalties to disputes far outside conventional trade grievances. Linking wildfire smoke directly to tariff rates, however, has no clear precedent in modern trade practice.

The next step rests with Trump and the Canadian prime minister, whom the president said he would call. No date for any tariff change or formal decision has been announced.

Friction between Washington and Ottawa over shared resources is not new. The two governments signed the Boundary Waters Treaty in 1909 to manage disputes over rivers and lakes along the border, and they later created the International Joint Commission to arbitrate conflicts. That framework endured for more than a century and settled repeated quarrels without either side resorting to economic reprisal.