Nippon Steel and U.S. Steel said Wednesday they have finalized their “historic partnership,” a deal that gives the U.S. government a say in some matters and comes a year-and-a-half after the Japanese company first proposed its nearly $15 billion buyout of the iconic American steelmaker.

Nippon Steel Corp. could issue equity to fund its $14.1 billion purchase of United States Steel Corp. and associated investment promises, the company’s vice chairman said on Thursday.

A national security agreement gives Trump the authority to name a board member as well as a non-economic golden share.