Trump Pledges to Double Tariffs on Foreign Steel and Aluminum to 50%

President Trump said on Friday that he would double the tariffs he had levied on foreign steel and aluminum to 50 percent, a move that he claimed would further protect the industry.

The announcement came as Mr. Trump traveled to a U.S. Steel factory outside Pittsburgh to hail a “planned partnership” that he helped broker between U.S. Steel and Nippon Steel, a corporate merger that he opposed last year as a presidential candidate. Although the details of the U.S. Steel deal are still murky — and Mr. Trump later admitted he had not yet seen or signed off on it — the president used the moment to cast himself as a champion of the embattled industry.

Speaking to a crowd of steel workers, Mr. Trump claimed that foreign countries had been able to circumvent the 25 percent tariff he put in place this year. The higher tariffs would “even further secure the steel industry in the United States,” Mr. Trump said.

It is not clear how much doubling the tariff rate would actually bolster the domestic steel sector, but the move gave Mr. Trump the opportunity to wield tariffs at a time when his other import taxes have proved vulnerable to legal challenges.

In a post on Truth Social, Mr. Trump said that the tariffs would take effect on June 4 and that they would provide a “big jolt” to American steel and aluminum workers.

Mr. Trump has in recent weeks announced large tariffs only to quickly reverse himself and pause them. Analysts suggested on Friday that Mr. Trump could be seeking new ways to gain leverage over trading partners as the pace of negotiations has proved to be painfully slow.