The American Federation of Teachers is suing Education Secretary Betsy DeVos, charging the Education Department is illegally and unconstitutionally failing to administer a student loan forgiveness program for millions of public service workers. The program, passed by Congress a decade ago, promises to cancel the student loan debts of qualifying government or nonprofit workers who make loan payments for 10 years. More than a million people signed up, but Department of Education figures show just 1% of applications for debt forgiveness have been approved.