Canada’s wildfire smoke crossed the border without paying a tariff.
President Trump wants to send the bill back.
Trump accused America’s northern neighbor of “willful negligence” Friday as thick smoke from hundreds of Canadian wildfires poured into the United States, fouling the air across the Midwest, Northeast and Mid-Atlantic.
“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!” Trump wrote on Truth Social.
The president said he planned to call Canadian Prime Minister Mark Carney and demand answers.
“I will call the Prime Minister during the day to find out what they are going to do about it,” Trump wrote.
Trump argued that Canadian officials had repeatedly failed to clear brush and debris that could fuel catastrophic fires, despite smoke becoming an almost annual summer visitor to American cities.
“Canada has refused to engage in basic Forest Management and Debris Removal, knowing that such refusal will lead to exactly this result,” Trump wrote.
“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.”
Trump did not explain how the administration would calculate the cost of Canadian smoke, which products would face higher duties or what trade authority would be used to impose a wildfire surcharge.
Canadian officials did not immediately respond publicly to the tariff threat.
The smoke problem, however, was impossible to ignore.
Nearly 850 wildfires were burning across Canada by mid-July, including more than 180 in Ontario, according to the Canadian Interagency Forest Fire Centre. Satellite images showed a sprawling plume moving east and south across the border. NASA documented the smoke stretching over heavily populated portions of both countries.
Air-quality alerts covered more than 20 states as smoke drifted from the Upper Midwest through the Northeast and into the nation’s capital. Washington was wrapped in a gray haze Friday, while residents across the affected region were warned to limit strenuous outdoor activity.
"We are holding Canada responsible… the United States is being unnecessarily invaded by filthy, polluted, and unhealthy air, the quality of which is dangerous, and totally unacceptable!" – President Donald J. Trump 🇺🇸 pic.twitter.com/LVsFinBcg1
— The White House (@WhiteHouse) July 17, 2026
