Alcoa has paused work on all growth projects in Canada due to Trump's tariffs, and may need to turn to the Canadian government for help if the levies remain in place, CEO Bill Oplinger said.

Alcoa Corp., the largest US aluminum producer, said tariffs on imports from Canada cost it $115 million in the second quarter, showing how US President Donald Trump’s trade agenda has affected the industry.

Alcoa says it hasn’t been able to pass along the full cost of the 50% U.S. tariff on aluminum the company produces in Canada. The Midwest delivery premium—a catch-all fee attached to aluminum purchases to cover costs for tariffs,