New Delhi, July 18 -- President Donald Trump is using wildfire smoke from Canada to threaten tariffs. more than 100 million people across the Midwest, Northeast and Mid-Atlantic breathing in dangerous air brought by thick, choking plumes of smoke from wildfires in Canada.

There are nearly 1,000 active fires across Canada as of Saturday, according to its government. So far this summer, about 3,500 fires - including a dozen blazes that flared up in Ontario in recent weeks - have burned more than 6 million acres in the country.

Writing on Truth Social on Friday, Trump accused Canada of failing to manage its forests properly, blaming the country directly for the smoke now smothering swathes of the US.

"The United States is being unnecessar...