Napolitano defends the planned tuition increases, which some students and lawmakers say are too steep.
Congress opened hearings Thursday on the September 11 attack on the U.S. diplomatic mission in Benghazi that killed four Americans, including the U.S. ambassador to Libya.
But the star witness won’t face questions until Friday – and it won’t be public.
Former CIA Director and retired four-star general David Petraeus will answer questions from the House and Senate Intelligence Committees early Friday morning.
Petraeus resigned as head of the intelligence agency last Friday, in the wake of an extramarital affair.