It is very tricky with HRC as the very likely nominee and his first SoS. This does make it harder for him not to want this to just go away. If there is even a statement that argues that what she did was wrong or that rules need to preclude this from ever happening again, it is a scandal in what has really been a pretty scandal free administration. On top of that, many things he did are more likely preserved or improved if he is succeeded by a Democratic.