Former Speaker Newt Gingrich (R-Ga.) says Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE's campaign is nothing but a front for corruption.

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"This is a giant criminal enterprise disguised as a foundation and disguised as a campaign," Gingrich said on Fox News.

"This is a level of corruption that permeates the federal government. This is a level of corruption that you find in the Veterans [Health] Administration, you find in the FBI now. [James] Comey has become a director who is corrupting the system and you can just tell."

Gingrich, a supporter of Republican presidential nominee Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE, says he keeps asking how Clinton could have avoided being indicted.

"And the reason is simple: the fix was in."

The former speaker often accuses Clinton, the Democratic presidential nominee, of corruption.

A report Monday said Gingrich played a previously undisclosed role in encouraging a conservative watchdog organization to investigate whether Clinton's private email system had ever been hacked.

According to notes from the FBI’s investigation into Clinton’s email system, which she used during her time as secretary of State, Gingrich served as a middleman to help an unidentified Senate staffer connect with the watchdog group Judicial Watch to test Clinton’s setup.