Tom Vilsack testifies during a hearing before the Senate Agriculture, Nutrition and Forestry Committee in 2016 on Capitol Hill.

WASHINGTON, DC – SEPTEMBER 21: U.S. Agriculture Secretary Tom Vilsack testifies during a hearing before the Senate Agriculture, Nutrition and Forestry Committee September 21, 2016 on Capitol Hill in Washington, DC. The committee held a hearing on “The U.S. Department of Agriculture and the Current State of the Farm Economy.” (Photo by Alex Wong/Getty Images)