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FBI investigators are expected to want to interview Hillary Clinton and her top aides over her use of a private email server while she served as Secretary of State.

CLEVELAND, Ohio -- Hillary Clinton continues to be dogged by both Bernie Sanders and her unresolved email scandal.

This week the Department of Justice granted limited immunity to the former Clinton aid who set up and operated a private server in her Chappaqua, New York home. Last year the aid, Bryan Pagliano, invoked his Fifth Amendment rights, to avoid testifying before Congress.

So far, 30,068 Clinton emails have been released. The New York Times reports that 22 of those emails have now been classified as "top secret", 65 are classified as 'secret,' and 2,028 are classified as "confidential."

According to people close to the case, Pagliano has turned over security logs for Clinton's private server. The logs reportedly show no signs of foreign hacking. But the logs are also not a definitive indicator of hacking.

Clinton is presently benefiting from the distraction of the Republican party's Trump-induced implosion. But attention will shift from Trump's 'hand" size, back to the size of the Clinton's classified email cache, if the case isn't resolved by time the GOP convention concludes.

While testifying before Congress on Tuesday, FBI Director James Comey was asked if he could say when the investigation would conclude. "I can't," said Comey. "What I can assure you is that I am very close personally to that investigation to ensure that we have the resources we need, including people and technology, and that it's done the way the FBI tries to do all of it's work: independently, competently and promptly. That's our goal, and I'm confident that it's being done that way, but I can't give you any more details beyond that."

As long as the possibility of Clinton or any of her aids facing criminal charges remains murky, it benefits both Bernie and the Republicans. It makes it harder for Clinton combat poll perceptions that she's untrustworthy.

FBI investigators are expected to want to question Clinton at some point. Ratings for tonight's CNN debate in Flint would jump if the FBI was asking Hillary Clinton questions instead of Wolf Blitzer.