Republican Senator Joni Ernst has introduced an amendment to the U.S. Senate's tax and spending megabill that would change two of the most contentious parts of that bill and could give a small boost to wind and solar projects that had been targeted in the draft being debated on the Senate floor.

The $3.3 trillion legislation survived a brief GOP revolt over the weekend to allow the Senate to move forward with debate on the measure, but its final passage is far from certain.

U.S. (R-Ky.) is holding his ground by opposing President Donald Trump’s “big beautiful bill.” The Senate is rushing to pass Trump’s legislation ahead of his Fourth of July deadline this week, but the bill has faced some GOP opposition over its cuts to Medicaid and increases to the national deficit.