As U.S. President Donald Trump formally signed an order doubling tariffs on imported steel and aluminum to 50%, Canada—the largest supplier of these metals to the U.S.—remains significantly impacted.

Prime Minister Mark Carney said Canada won’t respond immediately to the Trump administration’s doubling of steel and aluminum tariffs, and indicated that officials are in “intensive discussions” about the trade relationship between the countries.

Prime Minister Mark Carney says Canada will take "some time" on its response to increased U.S. tariffs on steel and aluminum.

Smoke from wildfires burning in three Canadian provinces covered about a third of the U.S. on Wednesday, forecasters said, but had little effect on air quality except in New England and parts of New York state and the Midwest.

More than 31,000 people were under evacuation across Canada on Wednesday as firefighters battled raging wildfires threatening towns and villages, authorities said.

Parts of central Pennsylvania are under a code orange air quality alert, but the Midwest is seeing bigger air quality problems.