Nippon Steel plans to invest $14 billion in U.S. Steel's operations including up to $4 billion in a new steel mill if the Trump administration green lights its bid for the iconic U.S. company, according to a document and three people familiar with the matter.

President Donald Trump travels to Pittsburgh Friday to celebrate a deal he once vowed to oppose - Japanese steelmaker Nippon Steel’s long-announced plans to buy iconic American steelmaker US Steel.

Last week, Trump announced that U.S. Steel would remain an American company after U.S. Steel and Japan-based Nippon Steel entered a partnership. Steel workers rejoiced, not only because thousands of jobs remained, but it also meant communities could continue to thrive.

President Donald Trump touts Nippon Steel’s partnership with U.S. Steel, calling it “a blockbuster agreement" that ensures the company “stays an American company."

Nippon Steel Corp., the Japanese company embroiled in lengthy battle to buy US Steel Corp., said it plans to spend 869 billion yen ($6 billion) at home to expand output from cleaner furnaces.

Nippon Steel investors and analysts are asking if its $15-billion deal to buy U.S. Steel , backed but not yet approved by President Donald Trump, is positive for the near term, even if its hopes for strong U.

Japanese-owned Nippon Steel has spent more than $6.1 million on federal lobbying efforts in its quest to take over US Steel.

If the US gets a 'golden share' of Nippon Steel's takeover of US Steel, it would be the latest example of how Washington, D.C. increasingly has a say in the operations of major companies.