In recent interviews Julian Assange more or less claims to have the goods on Hillary. If I had to guess, I suppose he might have email traffic showing that she lied to congress, for example in the exchange above with Rand Paul, or perhaps in some of her answers to questions about her private email server. The most impactful time to release this information is probably just before one of the debates.
Paul: "It’s been in news reports that ships have been leaving from Libya and that they may have weapons. And what I’d like to know is, that [CIA] annex that was close by [the State Department facility], were they involved with procuring, buying, selling, obtaining weapons, and were any of these weapons being transferred to other countries? Any countries, Turkey included?"If we lived in a country where rule of law applied, there might be serious consequences for this sort of thing. In the 21st century USA, we'll be lucky if any mainstream media outlets cover the story ;-) The NYTimes will probably just blame the Russians.
Clinton: “I don’t know. I don’t have any information on that.”