WASHINGTON — President Donald Trump on Friday told Pennsylvania steelworkers he’s doubling the tariff on steel imports to 50% to protect their industry, a dramatic increase that could further push up prices for a metal used to make housing, autos and other goods.

In a post later on his Truth Social platform, he added that aluminum tariffs would also be doubled to 50%. He said both tariff hikes would go into effect Wednesday.

Trump spoke at U.S. Steel’s Mon Valley Works–Irvin Plant in suburban Pittsburgh, where he also discussed a details-to-come deal under which Japan’s Nippon Steel will invest in the iconic American steelmaker.

Though Trump initially vowed to block the Japanese steelmaker’s bid to buy Pittsburgh-based U.S. Steel, he reversed course and announced an agreement la

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