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.

Nippon Steel Corp. plans to invest $14 billion in United States Steel Corp. if the Trump administration approves the merger of the companies, Reuters reported.Details of the plan include Nippon Steel investing $4 billion in a new steel mill,

US Steel (NYSE:X) shares gyrate before edging higher Monday, +0.6%, after Reuters reported Nippon Steel (OTCPK:NPSCY) (OTCPK:NISTF) plans to spend $14B on US Steel's operations including up to $4B in a new steel mill if the Trump administration approves the Japanese company's takeover bid,

U.S. President Donald Trump on Friday announced that U.S. Steel and Japan's Nippon Steel had agreed to form a "planned partnership" that meant the steel company would remain in the country, headquartered in Pittsburgh.