U.S. Steel said on Wednesday it has appointed three American directors to its board, more than a month after Nippon Steel closed its $14.9-billion acquisition of the company.

Its board is now comprised of seven directors, four of whom are U.S. citizens, including three independent U.S. directors.

Nippon had signed a national security agreement with the Trump administration in a bid to get the go-ahead for its acquisition of U.S. Steel.

The agreement gave U.S. President Donald Trump a non-economic golden share and the authority to name a member to the board.

The appointments include former AT&T CEO John Donovan, ex-Lockheed Martin chief Robert Stevens and Timothy Keating, who is currently the top boss at Keating Global.