President Donald Trump and Republicans in Congress are blaming Canada for the wildfire smoke traveling south from Ontario and putting much of the East Coast under unhealthy air quality warnings, accusing the government of mismanaging its forests, making swaths of remote woodland more prone to wildfires.

Smoke engulfed major cities, including Chicago, New York, and Washington, D.C., Friday morning, turning skies orange and hazy and causing the metropolitan areas to experience the worst air quality in the world.