BEGUN, THE TRADE WARS HAVE? Trump to Impose Steep Aluminum and Steel Tariffs.

The move fulfills a Trump campaign promise that helped fuel his surprise 2016 campaign victory in the industrial Midwest, and he told a White House meeting of industry executives that his coming measures—25% tariffs on steel imports, 10% on aluminum—would revive domestic manufacturing. “You’re going to see a lot of good things happen. You’re going to see expansion of the companies,” the president said.

But the impact on companies that use steel was swift and sharp. The Dow Jones Industrial Average tumbled more than 500 points, or 2%, after the announcement, as shares of big steel users, including auto makers Ford Motor Co. and General Motors Co., dropped even further.

A cascade of industry trade groups moved quickly to denounce the moves, including beer and boat makers worried about costlier aluminum, and manufacturers of chemicals, air conditioners, and oil pipelines all concerned about pricier steel inputs.

“It’s going to be expensive,” said Ed Bolas, chief financial officer at DyCast Specialties Corp., a Minnesota maker of parts for products including cutting tools and engines. “All of it will impact the consumer.”

Neither Smoot nor Hawley could be reached for comment.