There is no question that re-opening the FBI Investigation into Hillary Clinton’s email server is a big deal. The FBI normally avoids acting just before an election in order to avoid charges of political manipulation. NBC reports:
The FBI is reviewing a new batch of Hillary Clinton emails, bureau director James Comey said in a letter to the Senate Judiciary Committee on Friday.
“In connection with an unrelated case, the FBI has learned of the existence of emails that appear to be pertinent to the investigation … I agreed that the FBI should take appropriate investigative steps designed to allow investigators to review these emails to determine whether they contain classified information, as well as to assess their importance to our investigation,” he wrote.
The very first thing to note is that Comey made no mention of a grand jury. The emails whose existence he learned of may have been the result of a subpoena in another investigation. If that is the case, further subpoenas are quite possible, a tool that was left unused in the investigation to date.
There are 3 competing theories as to why he might be doing this now that come to mind.