President Donald Trump announced on Friday that U.S. Steel will maintain its headquarters in Pittsburgh as part of a “planned partnership.” This statement indicates a potential approval of a significant investment bid by Japan-based Nippon Steel in the American steelmaker, while the exact nature of the partnership remains uncertain.

Nippon Steel previously attempted a nearly $15 billion acquisition of U.S. Steel, which was blocked by former President Joe Biden and later subjected to a national security review. The President’s recent announcement, however, has led to speculation that he may be endorsing an alternative agreement, possibly an investment rather than an outright purchase.

The President’s statement has had a noticeable impact on the market. U.S. Steel’s shares saw a sharp increase following the announcement, suggesting investor approval of the potential partnership. However, this development follows earlier reports that President Trump was staunchly against foreign ownership of U.S. Steel, creating a cloud of ambiguity around this issue.

Both Nippon Steel and U.S. Steel have issued statements that laud the potential partnership as a significant boon for U.S. Steel and the American manufacturing base at large. Nippon Steel refers to the partnership as a “game changer,” while U.S. Steel promises growth and job creation through the planned collaboration.

The exact terms and the structure of the partnership have not been disclosed, leading to speculation as to who will exercise control over U.S. Steel moving forward. Reports indicate that the federal government might take a significant role in the company’s management, a notion supported by some union officials.

The United Steelworkers union has opposed Nippon Steel’s bid. However, some union representatives have expressed support for the potential investment, with one official suggesting that the federal government might have veto power over key decisions involving U.S. Steel’s operations.

The partnership, as proposed by President Trump, could inject $14 billion into the U.S. economy. Yet, the lack of detail surrounding the terms of the partnership leaves many questions unanswered. The status of U.S. Steel’s workforce and infrastructure under a potential foreign partnership will undoubtedly be of considerable interest in the coming days.