Before her exit from the Trump administration, Secretary of Education Betsy DeVos had one last warning for members of Congress. In a farewell letter addressed to Senate Majority Leader Mitch McConnell on Jan. 4, DeVos warned of the dangers of forgiving student loan debt. The Democratic Party has made student loan forgiveness one of its top policy priorities. With control of both houses of Congress and the presidency, the party would have the power to pursue such a policy in the next few years. “Importantly, I hope you also reject misguided calls to make college ‘free’ and require the two-thirds...