President Biden on Wednesday known as for main will increase to some tariffs on metal and aluminum merchandise from China, talking to members of a nationwide steelworkers union in Pittsburgh as he vies with former President Donald J. Trump for votes in Northern industrial states.

“These are strategic and focused actions which can be going to guard American employees and guarantee truthful competitors,” Mr. Biden instructed a crowd of about 100 union members on the United Steelworkers, which endorsed him final month. “In the meantime, my predecessor and the MAGA Republicans need across-the-board tariffs on all imports, from all international locations, that would badly damage American shoppers.”

The Biden administration has argued {that a} flood of low-cost exports from China is undermining American-made merchandise — jeopardizing Mr. Biden’s push to increase U.S. manufacturing, a central focus of his financial agenda.

In his speech, Mr. Biden mentioned he would ask the U.S. commerce consultant, Katherine Tai, to extend tariffs to what White Home officers mentioned could be 25 p.c on sure Chinese language merchandise that now face tariffs of seven.5 p.c, or none in any respect, pending the end result of an administration evaluation of the China tariffs initially imposed beneath Mr. Trump.

“I would like truthful competitors with China, not battle,” Mr. Biden mentioned, flanked by supporters and indicators that learn, “President Joe Biden: Standing With Staff.” “And we’re in a stronger competitors to win the financial competitors of the twenty first century with China or anybody else as a result of we’re investing in America, and American employees, once more.”

The transfer is one other effort by Mr. Biden to place up new boundaries to commerce with China in some industries — and to compete with Mr. Trump in a “robust on China” context with swing voters. A day earlier, Mr. Biden started a three-day swing by means of Pennsylvania, a vital battleground state, by giving a speech in Scranton through which he targeted on the tax code however repeatedly attacked Mr. Trump and accused him of favoring billionaires over the working class.

Mr. Biden’s plans on Chinese language commerce are extra focused than Mr. Trump’s, although. The previous president has known as for sweeping and steep new tariffs on imports from China and elsewhere, in a possible effort to fracture commerce strains between the international locations. Mr. Biden’s administration is reviewing present tariffs and is predicted to suggest elevating some charges on Chinese language merchandise whereas decreasing others.

At a morning cease for breakfast on his approach to Pittsburgh from Scranton, Mr. Biden was requested by reporters if he was fearful a couple of commerce warfare with China. “No commerce warfare,” he replied.

Earlier than Mr. Biden’s remarks, Ms. Tai introduced that her workplace had begun an investigation into China’s aggressive assist for shipbuilders and different associated industries, in response to a union criticism.

“The American industrial shipbuilding business is a shell of its former self,” the unions wrote in a submitting with the commerce consultant. They added, “The most important impediment to the business’s restoration is the unfair commerce practices of the world’s largest shipbuilding nation: China.”

In the complaint, the unions cite “a whole bunch of billions” of {dollars} in Chinese language authorities assist for the shipbuilding business. These embody supplying metal from government-owned corporations at below-market charges, together with quite a lot of efforts to steer low-cost loans and different financing to shipbuilders from state-run corporations. Ms. Tai known as the allegations “critical and regarding.”

The strikes threaten to deepen a commerce dispute with Beijing, which has criticized Mr. Biden for his personal efforts to subsidize American manufacturing — together with tax credit within the Inflation Discount Act that are supposed to enhance manufacturing of photo voltaic panels, electrical autos and different applied sciences aimed toward decreasing fossil gas emissions.

China’s Commerce Ministry sharply criticized the investigation in a launch, saying it was “full of numerous false accusations, misinterpreting regular commerce and funding actions as harming U.S. nationwide safety and company pursuits, and blaming China for its personal industrial issues.”

In his speech, Mr. Biden additionally reaffirmed his assist for the steelworkers union in a dispute over the proposed sale of the Pittsburgh-based U.S. Metal, a famed producer, to Nippon Metal of Japan.

Nippon officers have vowed to speculate billions in American manufacturing services, to maintain U.S. Metal’s headquarters in Pittsburgh and to honor present labor contracts. However the tried buy has drawn hearth from the union and a bipartisan group of senators, largely from industrial states, who say it might compromise nationwide safety.

Mr. Biden has signaled opposition to the deal, which his administration is scrutinizing on safety and antitrust grounds. He has mentioned repeatedly that he’ll stand with steelworkers within the dispute over the sale, although administration officers haven’t specified precisely what which means in coverage phrases. In Pittsburgh, the president appeared to vow a employee that he wouldn’t enable the corporate to go away the US — a transfer that nobody is discussing presently.

“Let’s preserve U.S. Metal in America,” one girl instructed Mr. Biden as he met with steelworkers earlier than his speech.

“Assured,” the president replied to cheers and applause.

David McCall, the worldwide president of the steelworkers union, praised Mr. Biden earlier than his speech.

“President Biden promised U.S.W. members that he had our backs,” Mr. McCall mentioned. “And it’s clear he does.”

Mr. Biden and Mr. Trump are combating for working-class votes in industrial swing states like Pennsylvania, Michigan and Wisconsin. Earlier on Wednesday, the Biden marketing campaign launched an advert that includes a steelworker selling Mr. Biden’s financial file and attacking Mr. Trump.

This week, Mr. Trump’s case over falsified enterprise data started in Manhattan, the primary of the 4 legal instances he faces to go to trial. Mr. Biden usually refrains from commenting instantly on the trial. However his tour of Pennsylvania is supposed to offer voters with a distinction to Mr. Trump’s authorized troubles.

In his speech in Pittsburgh, Mr. Biden did take a veiled swipe at Mr. Trump, referring to him as “my predecessor, who’s busy proper now.”

The gang laughed, seeming to get the joke about Mr. Trump’s whereabouts, though the previous president doesn’t even have to seem in court docket on Wednesdays.

Alexandra Stevenson contributed reporting.