Rep. Devin Nunes (R-Calif.) on Sunday called the FBI's decision to review new emails potentially related to Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonBiden slams Trump over golf gif hitting Clinton Overnight Cybersecurity: Equifax hit by earlier hack | What to know about Kaspersky controversy | Officials review EU-US privacy pact Overnight Tech: Equifax hit by earlier undisclosed hack | Facebook takes heat over Russian ads | Alt-right Twitter rival may lose domain MORE's private email server a "substantial development."

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"I just don't see Director [James] Comey opening this case back up 11 days before the election unless it is quite serious," Nunes, House Intelligence Committee chairman, said on "Fox News Sunday."

"Decades of experience, decades of receiving classified information, would not have known, that she was looking at, analyzing, communicated in classified information over an unsecured network. It's not believable."

Comey announced in July he would not recommend criminal charges over Clinton's use of a private email server while serving as secretary of State.

On Friday, he sent a letter to Congress saying that the bureau discovered emails “pertinent” to the investigation and would be reviewing them.

The new emails were reportedly discovered during a separate investigation into former Rep. Anthony Weiner (D-N.Y.) over an alleged online relationship with a 15-year-old girl.
 
When asked if there could continue to be more investigations into Clinton if the Democratic nominee wins and Republicans continue to hold onto the House, Nunes said: "We will clearly investigate al of the information that we have as it relates to classified information being put on unclassified networks where Russians, Chinese, other bad actors could get ahold of the information."
 
"I know that this is rhetoric," he said, "but this is Hillary Clinton's fault."