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The discovery of a potentially damning email that Hillary Clinton failed to turn over to the State Department is of "critical importance," according to Judge Andrew Napolitano.

On "Mornings With Maria," Judge Napolitano explained that the email was from top Clinton aide Huma Abedin to the then-secretary of state and her inner circle, saying that they had been hacked and they were temporarily disabling State Department security features to accommodate Clinton’s private server.

Judge Napolitano said this revelation directly contradicts Clinton's repeated claims that she never jeopardized national security secrets and that her emails were never hacked.

He added that U.S. District Court Judge Emmet Sullivan suspected that Clinton was not being forthcoming in releasing all her work-related emails, so he had her swear "under penalty of perjury" that she had surrendered all her governmental emails to the State Department.

"That is a code phrase for 'I think you're lying to me,'" Judge Napolitano explained.

He said that Clinton's failure to turn over this email could add perjury to an already "overwhelming" case, which could see her indicted for espionage, conspiracy, obstruction of justice and a variety of other charges.

He said that if the Justice Department declines to indict Clinton for political reasons, many FBI investigators and Justice Department prosecutors could rebel and leak details of the investigation.

"If FBI agents resign and leak on the eve of the election or the eve of the DNC, does President Obama have a Watergate-like, Saturday Night Massacre on his hands?"

The "Saturday Night Massacre" refers to Richard Nixon's 1973 firing of a special prosecutor and the resignation of his attorney general during the Watergate scandal.

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