TOKYO, Sept 4 (Reuters) - Japan's biggest steelmaker

Nippon Steel ( NISTF ), which is seeking to acquire U.S. Steel

, said on Wednesday if its purchase goes ahead core senior

management as well as a majority of board members at the U.S.

company would be U.S. citizens.

U.S. Steel's board would also include three independent

directors who are U.S. citizens, the Japanese company said in a

statement.

The announcement follows Democratic presidential candidate

Kamala Harris echoing President Joe Biden's concern over U.S.

Steel being acquired by Nippon Steel ( NISTF ).