Cliffs would purchase all of U.S. Steel for all cash and then sell off the Big River Steel subsidiary to Nucor, sources told CNBC's David Faber. U.S. Steel's headquarters would remain in Pittsburgh under the deal.

Cleveland-Cliffs Inc. is partnering with Nucor Corp. to weigh a potential joint bid for United States Steel Corp., according to a person familiar with the matter.

U.S. Steel shares rose after CNBC reported that Cleveland-Cliffs is partnering with Nucor for a possible bid to buy U.S. Steel.

Cliffs is partnering with peer Nucor to prepare a potential bid for U.S. Steel, a person familiar with the matter told Reuters on Monday. Cleveland-Cliffs would purchase U.S. Steel in an all-cash deal,

Nippon's offer to buy USS was $14 billion while, according to Cliff CEO Lourenco Goncalves, Cliffs' final bid was $13.8 billion. Before Biden killed the Nippon deal, a bipartisan group, including incoming President Donald Trump, also opposed the deal.

Cleveland-Cliffs CEO Lourenco Goncalves’ nearly two-hour news conference Monday afternoon was called to mark five years since he acquired Butler Works and the rest of AK Steel, taking what was a sprawling steelmaking plant on the brink of closure and giving it life well into the future.

Development follows the Biden Administration's decision to block Japan's Nippon Steel from taking over US Steel.

Cleveland-Cliffs offered the company roughly $7.3 billion for a buyout in July 2023, though it was rebuffed. In a lawsuit filed earlier last week, U.S. Steel and Nippon say Cleveland-Cliffs conspired with the United Steelworkers Union to put pressure on Biden and the regulatory process to steer the deal back into its hands.

After Nippon Steel's bid was thwarted by the Biden administration, other American competitors are looking for an acquisition.