President-elect Donald Trump is underscoring his intention to block the purchase of U.S. Steel by Japanese steelmaker Nippon Steel Corp., and he’s pledging to use tax incentives and tariffs to strengthen the iconic American steelmaker.

The announcement reiterated sentiments the president-elect expressed on the campaign trail, and further imperiled a deal that had already run into widespread political opposition.

"I am totally against the once great and powerful U.S. Steel being bought by a foreign company, in this case Nippon Steel of Japan," Trump wrote on his social media platform Truth Social. Nippon Steel hopes to close the deal before Trump retakes the White House on Jan.

President-elect Donald Trump vowed on Monday to block Nippon Steel's purchase of U.S. Steel, saying on social media he would make the once iconic company "strong and great again."

President-elect Trump said he would use a series of tax incentives and tariffs to block Nippon Steel's planned purchase of American manufacturing firm U.S. Steel.

"I'm on the side of making steel. I'm on the side for making steel for whoever owns this facility," said worker Jesse Smith. "I'm partial towards it being domestic and individuals

This April 26, 2010, shows the United States Steel logo outside the headquarters building in downtown Pittsburgh. President-elect Donald Trump is underscoring his intention to block the purchase of U.

Donald Trump reiterated his opposition to the sale of United States Steel Corp. to Nippon Steel Corp., saying he’d instead use tariffs and tax incentives to revive the American steelmaker.

President-elect Donald Trump has repeatedly said he intends to block a Japanese firm’s $15 billion takeover bid of US Steel upon taking office, saying the former American giant can eventually stand on its own.