President Donald Trump escalated trade tensions with Canada on Friday, threatening new tariffs and accusing the Canadian government of “willful negligence” in its handling of massive wildfires whose smoke has drifted into the United States, worsening air quality across the Midwest and East Coast.

In a post on his Truth Social platform, Trump wrote: “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!”

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The president’s remarks come as more than a dozen U.S. states remain under air quality alerts. Major cities including Chicago and Washington, D.C., have urged residents to stay indoors or wear masks due to hazardous pollution levels. The smoke originates from hundreds of active fires burning across Canada and in northern Minnesota.

According to the Canadian Interagency Forest Fire Centre, based in Winnipeg, Manitoba, there were 897 active fires as of Friday, with Ontario, Quebec, and the Northwest Territories experiencing the most intense activity. Fewer than 100 of those fires are classified as “under control.”

Trump accused Canada of failing to engage in basic forest management and debris removal, saying the refusal “will lead to exactly this result.” He added: “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.”

The threat represents a significant escalation in the Trump administration’s trade policy. The president has previously imposed tariffs on Canadian steel and aluminum and has threatened to levy duties on Canadian lumber. The latest move ties trade penalties directly to an environmental issue that crosses international borders.

Canadian officials have not yet publicly responded to Trump’s latest tariff threat. However, the dispute adds another layer of friction between the two countries, which are each other’s largest trading partners. The issue also highlights the growing frequency of transboundary smoke events, which scientists link to climate change and forest management practices.

In related news, Trump is scheduled to attend a FIFA World Cup final reception in New York City, an event that comes amid the ongoing wildfire smoke crisis and controversy over the tournament’s logistics. Meanwhile, the administration has also been tightening visa rules for foreign journalists, including a new 90-day limit for Chinese press, and has faced criticism from lawmakers over unsubstantiated claims about election security.

The White House did not immediately provide additional details on the proposed tariff rates or implementation timeline. The story is developing.