BEIJING — China tried to step up pressure on Washington in their growing tariff war Thursday by suggesting U.S. companies lobby American leaders, while a Korean union warned that President Trump’s threat of higher auto import duties could lead to job losses in Alabama.

Beijing and Washington have yet to resume negotiations over the dispute that led to tariff hikes on each other’s goods last week, said a spokesman for the Chinese Commerce Ministry. “We hope American companies do more to lobby the U.S. government and work hard to safeguard their own interests,” Gao Feng said at a news conference.

Although some U.S. companies and lawmakers have criticized Trump’s tactics, Gao’s statement was an unusually direct attempt to rouse domestic American opposition. Beijing frequently rejects foreign comments about its own policies as improper interference in its affairs.

Gao gave no details. His remark about lobbying was missing from an official transcript on the ministry’s website, suggesting officials recognized its potential sensitivity.

The Trump administration imposed a 25 percent tariff on $34 billion worth of Chinese goods last Friday in response to complaints that Beijing pressures companies to hand over technology or steals it. Beijing responded by imposing similar duties on the same amount of imports from the United States.

Washington announced a second possible round of tariff hikes Tuesday targeting a wider range of $200 billion in goods. Beijing vowed “firm and forceful measures” in response, but China’s lopsided trade balance means it cannot match the full scale of American tariff hikes. That has prompted concern that regulators might expand retaliation to trying to hamper operations of American companies in China.

Chinese leaders have tried to deflect criticism by pointing to the benefits of trading with the world’s second-largest economy, a theme Gao repeated Thursday. He noted Tesla Inc.’s announcement this week of plans to build a factory in Shanghai.

China has a “great potential consumer market that is steadily more open,” said Gao. “We will continue to improve the business environment and protect the legitimate rights of foreign companies in China.”

As for negotiations, he said, “the two sides have not been in touch about restarting talks.”

Meanwhile, the labor union for Hyundai Motor Co. warned that a downturn in U.S. auto imports because of Trump’s threatened tariffs could force the company to curtail work at the Alabama factory it opened in 2005.

The Department of Commerce is investigating whether auto imports from Europe, South Korea, Japan and other U.S. allies pose a threat to national security and should be limited.

The union said in the event of a downturn, its contract requires Hyundai to idle factories abroad before those in South Korea. The Alabama factory “could be the first one to be shut down, putting some 20,000 American workers at risk of layoffs,” said a union statement.

A group representing global automakers warned last month that Trump’s tariff plans could cost hundreds of thousands of jobs.

“The cumulative tariffs that both countries are beginning to implement will harm each other’s economies and jobs,” John Frisbie, president of the U.S.-China Business Council, which represents American companies that do business in China, said in a prepared statement.

Frisbie called for the two governments to “stop the needless escalation of a tariff war and start working on solutions” to complaints about Chinese technology policies.

Also this week, Chicago Mayor Rahm Emanuel visited Beijing on a mission to try to lock in a $1.3 billion deal for a Chinese company to assemble rail cars in his city.

Emanuel met with Vice President Wang Qishan, China’s commerce minister and executives of the Chinese railway manufacturer. The mayor said he was committed to the project but gave no indication whether the Chinese company had given him reassurances about its status.

“They wanted to communicate, obviously, that this (trade war) is not their preference,” Emanuel said Thursday. “They would rather work something out, but they’re not scared if this is where it goes.”

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