US manufacturers split over Trump overcapacity probe, tariffs ahead

American manufacturers are split over whether Donald Trump’s new overcapacity probe will shield domestic industry or simply shift costs onto importers, farmers and consumers. Companies seeking relief say excess production in China and other economies is crushing prices and investment; firms that rely on global inputs warn that higher duties could trigger retaliation and make U.S. products more expensive.

The debate took center stage as the Office of the United States Trade Representative opened four days of hearings on May 5 in Washington, D.C., under Section 301 of the Trade Act of 1974. The hearings are being held at the U.S. International Trade Commission’s main room at 500 E Street SW, will not be livestreamed and will be followed by a posted transcript. Nearly 150 company, trade-group, foreign-government and think-tank representatives are expected to testify through Friday.

USTR launched the overcapacity investigations on March 11 and said they cover 16 economies: China, the European Union, Singapore, Switzerland, Norway, Indonesia, Malaysia, Cambodia, Thailand, South Korea, Vietnam, Taiwan, Bangladesh, Mexico, Japan and India. In its launch statement, the office said foreign overproduction can displace U.S. production and deter new investment, and framed the effort as a way to protect manufacturing capacity and “reshore critical supply chains.”

The notice singled out China and Japan’s automotive sectors as examples of concern, citing firms that are unprofitable or unable to meet interest payments. That language reinforced the argument from supporters of tougher action, who say Beijing’s industrial scale distorts markets and undercuts U.S. competitiveness. Critics counter that broad tariffs rarely stop excess capacity abroad and often raise costs at home for manufacturers that import parts, for agriculture and for consumers.

The hearing has become a test of how far the administration wants to go in using trade barriers as industrial policy. Trade watchers broadly expect the probe to produce new import duties, especially as the White House seeks to rebuild tariff leverage after the Supreme Court struck down earlier global tariffs imposed under a national-emergencies law. The administration is also running a parallel Section 301 probe into forced-labor enforcement by roughly 60 economies, on an accelerated timetable that aims to finish by July, when a temporary 10% global tariff is due to expire.

USTR said written comments and requests to appear were due April 15 at 11:59 p.m. EDT. With the hearings now underway and testimony running through May 8, the question is no longer whether Washington will act, but which parts of American industry will pay the price.