Elizabeth Cobbs, novelist and historian at Texas A&M University and the author of The Hello Girls: America's First Women Soldiers (Harvard University Press, 2017), and Catherine Clinton, professor of history at the University of Texas, San Antonio, and the author of Harriet Tubman: The Road to Freedom (Little, Brown and Company, 2004), discuss their open letter to Treasury Secretary Mnuchin, signed by 125 fellow historians, calling for him to commit to plans to feature Harriet Tubman on the twenty-dollar bill.