President Donald Trump has expressed concern over the impact of Canadian wildfire smoke on air quality in the US. He claims that the cost of this pollution is significant and has threatened to hold Canada responsible for associated costs.

The president has suggested that the cost of pollution from the wildfires could be added to tariffs that Canada is currently paying. Trump has a history of using tariffs as a means of resolving disputes with other countries.

Further details on the president's plans and the potential impact on the US and Canada are available from the source, including a post from Trump on Truth Social and his intentions to contact Canadian Prime Minister Mark Carney.