Democratic vice presidential nominee Tim KaineTimothy (Tim) Michael KaineDemocrats plow ahead as Manchin yo-yos Senate advances defense bill after delay Overnight Defense & National Security — Presented by Boeing — Senators to take up defense bill Wednesday MORE said Sunday that FBI Director James Comey's letter to lawmakers regarding the Hillary ClintonHillary Diane Rodham ClintonRepublicans seem set to win the midterms — unless they defeat themselves Poll: Democracy is under attack, and more violence may be the future Popping the progressive bubble 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.).