Newly uncovered emails the FBI says may be “pertinent” to the investigation into 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 private email server were discovered when the FBI seized devices belonging to longtime Clinton aide Huma Abedin and her estranged husband, Anthony Weiner, according to The New York Times.

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Weiner, a former congressman, is under investigation for allegedly engaging in a sexual relationship with an underage girl.

Last month, The Daily Mail published an interview with a 15-year-old girl who said Weiner had sent her sexually explicit messages.

Weiner resigned from Congress in 2011 after it was revealed that he was sending sexually explicit messages to multiple women.

In a letter sent to lawmakers on Friday, FBI Director James Comey said the bureau has learned of the existence of more emails "that appear to be pertinent to the investigation." The messages were found "in connection with an unrelated case," Comey wrote, without further explanation.

After being briefed by his team, Comey "agreed that the FBI should take appropriate investigative steps" to determine whether the emails "contain classified information, as well as to assess their importance to our investigation."

Comey said he could not predict how long it would take the bureau to decide whether the newly found emails are "significant," meaning the investigation could hang over the Democratic presidential nominee's head through the election.