WASHINGTON, May 22 (Reuters) - The United Steelworkers

union urged U.S. President Donald Trump on Thursday to block

Nippon Steel's ( NISTF ) bid for U.S. Steel despite a

pledge by the Japanese steel giant to invest $14 billion in the

iconic American company, as first reported by Reuters.

In a statement published a day after a powerful national

security panel submitted a fresh recommendation on the deal to

Trump, the union said, "Now, as it continues to make flashy

promises about proposed investments, it remains clear Nippon is

simply seeking to undercut our domestic industry from the

inside."

Nippon Steel ( NISTF ) and U.S. Steel did not immediately respond to

requests for comment.