As president, Donald Trump imposed a 25% tariff on foreign steel, which hurt Clips & Clamps Industries, a Michigan auto supplier — raising its materials prices, making it harder to compete with overseas rivals and costing it several contracts.

Jeff Aznavorian, the company president, thought he might enjoy some relief once Joe Biden entered the White House. Instead, Biden largely preserved Trump's tariffs — on steel, aluminum and a mass of goods from China.