Democratic vice presidential nominee Tim KaineTimothy (Tim) Michael KaineHannity snaps back at 'Crybaby' Todd: 'Only conservatives have to disclose relationships?' Chuck Todd lashes out at Fox, defends wife in radio interview Overnight Defense: Trump steps up fight with California over guard deployment | Heitkamp is first Dem to back Pompeo for State | Dems question legality of Syria strikes MORE said Sunday that FBI Director James Comey's letter to lawmakers regarding the Hillary ClintonHillary Diane Rodham ClintonOvernight Defense: Pompeo clears Senate panel, on track for confirmation | Retired officers oppose Haspel for CIA director | Iran, Syria on agenda for Macron visit George H.W. Bush in intensive care GOP chairmen say they have deal with Justice on documents MORE email server investigation is "unprecedented."

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"I just have no way of understanding these actions. They're a completely unprecedented move," the Virginia senator said during an appearance on ABC's "This Week" with George Stephanopoulos.

"When you haven't even seen the material yourself 11 days before an election, why would you talk about an ongoing investigation?" Kaine asked.

Clinton, the Democratic presidential nominee, made similar comments during a campaign rally in Daytona Beach, Fla., on Saturday.

"In fact, it's not just strange, it's unprecedented and it is deeply troubling," said Clinton.

Following Comey's letter to lawmakers on Friday, The New York Times reported that the emails potentially pertinent to Clinton's server were discovered during a separate FBI investigation into former Rep. Anthony Weiner (D-N.Y.).