Sens. Amy Klobuchar (D-Minn.), Steve Daines (R-Mont.), John Boozman (R-Ark.) and Raphael Warnock (D-Ga.) led a letter to U.S. Trade Representative Jamieson Greer emphasizing the importance of the U.S.-Mexico-Canada Agreement (USMCA) for American farmers ahead of the agreement’s six-year joint review and urging improved market access and certainty for producers.