MUELLER: The number of plots that we have disrupted would be in the dozens, and not just disrupted here but disrupted overseas. The ability now to work and exchange information with the CIA, with NSA, with our counterparts in the intelligence services and law enforcement entities overseas has grown substantially. And that makes us all safer.
CNN: Do you think the government botched the Edward Snowden (matter), letting him slip out of the country?
MUELLER: Well, I mean I don't think there was any opportunity to -- that would -- you would look back and say look, 'we botched something like that.' No. I don't think that's accurate at all.
CNN: What about just detecting what he was doing?
MUELLER: I think you will see, without getting into the details, ourselves, the NSA and others, are putting into place measures that would perhaps stop an individual such as this, in the future, undertaking the same activity.
CNN: How much of a hero do you think he is? Has he done anything useful here?
MUELLER: I'm not going to comment on it. All I will tell you is that there are outstanding charges and our expectation is that he can and should be brought to justice.
CNN: You talk a lot about the cyber threat.
MUELLER: A cyber attack would be devastating, on the financial institutions, for instance. ... It could be hospitals, it could be infrastructure, it could be the energy infrastructure. But now we are aware of these potential targets and DHS, ourselves, the NSA, DOD, are all making preparations to prevent that from happening. But an attack will probably slip through at some point in time.
CNN: Do you think the Benghazi investigation was a failure?
MUELLER: No, absolutely not.
CNN: Getting people on the ground so late.
MUELLER: No, no, no, no, no, no. It's not a failure. ... It's a unique situation. I'm not going to tell you it's not, because it is a unique situation and very difficult for us to operate. .. When we had these African bombings of those embassies, we had an intelligence service in there that helped us. We had law enforcement agencies that helped us. We had access. In Libya, you have a government that does not control most of Libya, or a good portion of Libya. And consequently, the ambassador, the State Department, ourselves -- were pushing to get in there at the earliest possible moment. And that ended up being a couple of weeks down the road. But that does not mean that we have not very thoroughly investigated that and are continuing to investigate it. And I do believe the persons responsible will be brought to justice.
CNN: Can you predict when?
CNN: The Boston bombing? Do you think the FBI did everything it could and do you think there's any fix in the way situations like that are handled so that you might be able to prevent something like that from happening?
MUELLER: We got notice from the Russians who looked at this particular individual and the agent who received that on the Joint Terrorism Task Force did a very thorough job in following up that. He ran all the -- all of the traces. (Went) to the college that he had attended (and) interviewed the parents and ultimately interviewed him and could not find any basis to do a further in -- investigation. So I think we did follow up on that.
CNN: Now, in the context of the Joint Terrorism Task Force, are there other things that perhaps could be done?
Yes, one or two.
CNN: Do I think it would have made any difference?
Probably not. It's all speculation. ... We are pretty good at what we do at this point. And so in the future, it may be if you have other attacks, that person may have been on our radar screen. But everybody who comes on our radar screen, we cannot investigate, indict and prosecute.
CNN: What could have been done? Could you have gone to the Russians and been more forceful in asking for more information?
MUELLER: Well, we asked on, what, two, I think three occasions. We got the information back to the Russians and we went to the Russians and said will you -- what more do you have? We couldn't get anything more out of them.
CNN: Would there have been any other things you could have followed up that you didn't?
MUELLER: At that time, the only thing that we could have been alerted to his travel back and forth to Russia. That is the only thing that was different.