And saving jobs in the steel industry has only become more difficult, Russ said, due to technological advancements that mean employers now need fewer workers to produce the same amount of steel.
"How many jobs can we save if we raise the price of steel in the U.S.? It's hard to tell," Russ said. "You'd basically have to tell industries to stop innovating."
UCLA economist Edward Leamer said Trump's protectionist actions — through previously announced tariffs on imports of solar panels, washing machines and now steel and aluminum — could end up threatening more domestic jobs than they're intended to save.
"The reality is, in the areas of coal and steel, he's not going to be creating enough jobs to make a difference," said Leamer.
Los Angeles-based Hannibal Industries relies on domestic and imported steel. Executive vice president Steve Rogers says it's too soon to tell how his company would fare under Trump's tariffs, but he's concerned about rising costs and supply issues.
"There is not enough domestic steel-making capacity to fulfill steel demand in the United States," Rogers said.
Hannibal has more than 300 workers at its facility in Vernon, just outside of downtown Los Angeles. They take steel and fashion it into racks and tubes used for shelving units in warehouses. Rogers worries that tariffs could end up giving an advantage to foreign companies making the same products.
"We do compete with foreign finished goods, which we already have a hard time competing with just on a cost basis," he said.
About 25 percent of imported steel comes into the U.S. through the ports of Los Angeles and Long Beach.
Last year, a steel mill in Fontana — California Steel Industries — expressed concern about tariffs, saying Western states rely on imports. In a letter to the U.S. Department of Commerce, President and CEO Marcelo Botelho Rodrigues wrote that if tariffs were imposed, "the result could be the loss of thousands of U.S. jobs."