State Department Resumes Investigation of Hillary Clinton Emails

"We will aim to be as expeditious as possible," says a spokesman.

In April, the State Department halted its review of potential mishandling of classified materials to allow the FBI to complete its probe that began in March.

Kirby continued, "We will aim to be as expeditious as possible. But we will not put artificial deadlines on the process."

He added that the goal of the State Department's review would be to be as "as transparent as possible about our results, while complying with our various legal obligations."

Earlier this week Kirby noted that the State Department has "an administrative process to evaluate cases where information may have been mishandled. And as I've said previously, as the request of the FBI we didn't move forward with that process, so as not to interfere with their investigation."