Sen. Thom Tillis (R-N.C.), who announced he wouldn’t seek reelection following his decision to vote down President Donald Trump ’s sweeping domestic policy bill earlier this month, on Wednesday slammed Defense Secretary Pete Hegseth as “out of his depth” in his role at the Pentagon.

The deal would see the Defense Department take a 15% stake in MP Materials and spend billions of dollars investing in the company and purchasing its output.