Japan’s Nippon Steel reportedly told the White House it would give the U.S. government veto power over any reduction in U.S. Steel’s production capacity if the merger is approved. The eleventh-hour promise comes as President Joe Biden must decide the fate of the $15 billion deal by Jan. 7. Nippon guaranteed it wouldn’t reduce production capacity at U.S. Steel facilities in Pennsylvania, Indiana, Alabama, Texas, California and Arkansas without approval from the U.S. government, according to the Washington Post. Biden, who has less than three weeks left in the White House, has opposed the deal for months. Meanwhile, President-elect Donald…