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FBI documents related to the investigation into Hillary Clinton's private email server show an employee at Platte River Networks, the company that managed the server, refer to the "Hillary cover-up."

That unnamed employee apparently satisfied FBI agents with the explanation that his 2014 email reference to the "cover-up" was merely a joke.

Judge Andrew Napolitano said on "America's Newsroom" today that he - like many Americans - is not satisfied with the FBI's investigation.

Judge Napolitano explained that the agency still has not revealed when Clinton's server was cleared with BleachBit and when her mobile devices were destroyed with a hammer, but the evidence suggests that both of these actions were taken after a congressional subpoena was issued.

"Why the FBI would look the other way in the face of destruction of evidence and obstruction of justice is very telling," Judge Napolitano said. "It tells me, and those of us that watch these things, that somewhere from above - the White House - they were told, 'Exonerate her at all costs, no matter what you see, because she's got to be available to run against Donald Trump.'"

He said that many Americans have been prosecuted in similar situations - for crimes including espionage, perjury and destruction of evidence and obstruction of justice - and that's a fact Donald Trump should bring up at the first presidential debate tonight.

"If Donald Trump is smart tonight, he will not accept her statement that the FBI cleared her," Judge Napolitano said. "The evidence that the FBI has revealed ... has been so damning. It is far more damning that what we knew about the case beforehand."

"I expect that he'll make a big deal about that, and that should resonate well with the people watching the debate."

Watch more above.

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