In the Iowa U.S. Senate election on November 3, 2020, incumbent Republican Joni Ernst won re-election for a second term, receiving 51.74% of the votes compared to Democratic challenger Theresa Greenfield's 45.12%. This election was one of the most competitive and costly in the nation, with significant financial backing from both parties as Democrats sought to flip the seat and gain Senate control. Despite polls showing a close contest and criticism of her debate performance, Ernst achieved a clear victory, benefiting from strong support in rural communities.