Hillary Clinton with Huma Abedin
Hillary Clinton with Huma AbedinReuters

Senior officials say the US Justice Department opposed the FBI's plan to inform Congress of the discovery of new relevant emails.

However, FBI Director James Comey disregarded their request, saying, "In the end, we decided it was better to keep Congress informed."

97% of US Justice Department officials support Democratic candidate Hillary Clinton.

The newest set of emails was found during an investigation of former Congressman Anthony Weiner. Weiner and his wife, Huma Abedin, had used the same computer enabling a new cache of Clinton emails, her correspondence with Abedin, to be discovered.

The FBI has not yet analyzed the Clinton-Abedin email correspondence to see if it contains classified information.

The FBI does not usually tell Congress about ongoing investigations, but in this case, Comey felt obligated to do so.

"Here I feel an obligation to do so, given that I testified repeatedly in recent months that our investigation was completed," he said. "I also think it would be misleading to the American people were we not to supplement the record. At the same time, however, given that we don't know the significance of this newly discovered collection of e-mails, I don't want to create a misleading impression."

Democratic senators also wrote a letter asking the FBI to provide information about their renewed probe into the Clinton email scandal.

"Just ten days before a presidential election, the American people deserve more disclosure without delay regarding the FBI's most recent announcement," they wrote. "Anything less would be irresponsible and a disservice to the American people."

The Clinton email scandal had been considered closed until the FBI announced it was renewing its probe on Friday. While Clinton was originally optimistic, she now admits to being "deeply troubled" by the probe and its possible implications for her campaign. She gave the impression that she is not sure she can trust the FBI by questioning the timing.

NBC News contributed to this article.