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 analysis also found that 11.8 million more Americans would become uninsured by 2034 if the bill became law.

Senate Republicans can afford to lose no more than three of their own votes on the bill, but two already are opposed and others remained undecided.