President Trump announced that he would be doubling tariffs on steel to 50% as he visited a U.S. Steel mill in the Pittsburgh suburbs Friday, a week after teasing a " planned partnership " between the company and its Japanese competitor Nippon Steel.

"We are going to be imposing a 25% increase. We're going to bring it from 25% to 50% the tariffs on steel into the United States of America, which will even further secure the steel industry in the United States," he said.

The Nippon deal will allow U.S. Steel's headquarters to remain in Pennsylvania, according to Mr. Trump, who characterized the agreement last Sunday as "an investment" and "partial ownership" that will be "controlled" by the United States. The administration, however, has released few details about the deal.

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