WASHINGTON, April 4 -- Sen. Roger Marshall, R-Kansas, issued the following news release: * * * Senators Marshall, Ernst, and Slotkin Work to Ensure Fertilizer Access for Farmers Washington - U.S. Senator Roger Marshall, M.D. (R-Kansas) joined Senator Joni Ernst (R-Iowa), Senator Elissa Slotkin (D-Michigan), and other members of the Senate Agriculture Committee today urging U.S. Department of the Interior Secretary Doug Burgum to reinstate potash and add phosphate - both critical fertilizer in more PR