TOKYO, Jan 6 (Reuters) - Nippon Steel 5401.T President Tadashi Imai said filing a lawsuit against the U.S. government is one of the "important options", Nippon Television reported on Monday, after President Joe Biden blocked its proposed purchase of U.S. Steel X.N citing national security concerns.
(Reporting by Mariko Katsumura; Editing by Jamie Freed)
((Mariko.Katsumura@thomsonreuters.com;))