President Donald Trump is threatening new tariffs against Canada over wildfire smoke drifting into the United States.

The thick smoke enveloped the nation’s capital in a gloomy, eerie haze and prompted Major League Baseball’s Cleveland Guardians to postpone their game against Pittsburgh Pirates in Ohio. Warnings of ...

Heavy smoke from several large wildfires blazing in Canada and Minnesota is engulfing large swaths of the Midwest and the U.S ...