The foreign takeover he swore he would stop
As President, I will block this deal from happening. Buyer Beware!!!
On Nippon Steel's purchase of U.S. Steel · December 2024
Months later, in office, he approved it, traveling to Pittsburgh to celebrate the sale of the iconic American steelmaker to Japan's Nippon Steel as "the largest investment in the history of Pennsylvania." The United Steelworkers union, which represents the workers, never dropped its opposition: "Issuing press releases and making political speeches is easy. Binding commitments are hard." Dave McCormick, who had also opposed the deal as a Senate candidate, reversed and called it "great."
Sources: His 2024 vow, in his own words (WESA, Pittsburgh) · The approval, and the union's opposition (AP via AOL)