Hint: it won't be to "repent".
Pickering is a professional bureaucrat and a card-carrying member of the Washington Establishment, Foggy Bottom chapter.
Yes, Pickering is an insider’s insider. But if he first declined to testify, and as of Wednesday he wants to, that would suggest that he heard something yesterday that he wants to squelch real hard. That runs counter to the party line put out today that there is nothing to see here.
That internal review that Hillary assigned Pickering and Mullens to conduct seems to be under some review itself, although the administration has tried to discount that by saying that all such internal reviews are part of the action.
There is something there that is very important.