Stone has denied having advance knowledge of the publication of the hacked emails, but, in August 2016, before the emails of Clinton campaign chairman John Podesta were released by Wikileaks in October 2016, Stone tweeted that “it will soon be Podesta’s time in the barrel.” His tweet suggested that he knew that Podesta’s emails had been hacked and would be released.

What might this mean for Mueller and his team? The indictment filed against 13 Russians in February provides a clue. That indictment charged the defendants with what is known as a Klein conspiracy, that is, a conspiracy to defraud the United States. A Klein conspiracy is an agreement to impair, obstruct or defeat the lawful functioning of some agency of the federal government. In this case, the affected agency was the Federal Election Commission, among others, in its role to administer federal elections. The February indictment focused on the use of social media to improperly influence the election. Until then, it was unclear whether Mueller would pursue such a theory. Now that he has done so in one case, it would not be a stretch to envision another indictment charging the Russian intelligence agent known as Guccifer 2.0 and others under a similar theory based on the hacking of the emails.