New Delhi, July 19 -- WASHINGTON - The haze arrived first. By Thursday afternoon, air quality alerts covered more than 100 million Americans across a corridor stretching from Minneapolis through Chicago, Detroit, Cleveland, Pittsburgh, Philadelphia, and into New York City - a brownish-orange ceiling pushed south by wind currents carrying smoke from wildfires burning in British Columbia and Alberta.

Trump's response came via Truth Social.

"The cost is incalculable!" the president wrote Thursday, accusing Canada of "willful negligence" in managing its forests. He threatened to impose additional tariffs unless Ottawa took action, and pledged to call Canadian Prime Minister Mark Carney to discuss the matter. As of Friday morning, no such ca...