Nippon Steel shares rose on Monday after U.S. President Donald Trump approved its $14.9 billion bid for U.S. Steel , clearing a key hurdle in its 18-month pursuit and securing access to a vital market for its growth strategy.

President Trump on Friday cleared the way for Japan-based Nippon Steel to potentially acquire U.S. Steel, though details about the structure of the deal — including a possible "golden share" held by the federal government — remain unclear.

Pittsburgh's Action News 4 anchor Andrew Stockey sat down with Republican Senator Dave McCormick prior to his event in Pittsburgh's South Park neighborhood Monday.

President Donald Trump would have unique influence over the operations of U.S. Steel under the terms of the investment being made by Nippon Steel.