CLAIRTON, Pa. — (WPXI) – The sale of U.S. Steel to Nippon Steel in Japan might come down to whether or not a committee on foreign investment deems it a national security concern. One local councilman believes that reason is “nonsense.” Allegheny County Councilman Dan Grzybek supports the $15 billion sale of U.S. Steel to Nippon Steel, saying it would benefit the whole region. “Nippon has already promised to put even more money into the Mon Valley, and I think it would be good for the longevity of the area,” Grzybek told Channel 11’s Andrew Havranek. But, the Committee on Foreign Investment in the United States, or CFIUS, is reviewing the bid of the potential sale to see if there are national security concerns. Their recommendation is expected in the next 10 days. Both President Joe Biden and President-elect Donald Trump have expressed the desire to block the sale. So has the United Steel Workers Union. On Tuesday, union leadership sent a letter to its members saying Nippon was resorting to bribery to get the deal across the finish line. Nippon announced it would give $5,000 to employees other than senior leadership if the deal is finalized. U.S. Steel is holding a rally at its Clairton plant Thursday at 3 p.m. in support of the sale.