Democratic vice presidential nominee Tim KaineTimothy (Tim) Michael KainePoll: Kaine leads GOP challenger by 19 points in Va. Senate race GOP offers to ban cameras from testimony of Kavanaugh accuser Corey Stewart fires aide who helped bring far-right ideas to campaign: report MORE said Sunday that FBI Director James Comey's letter to lawmakers regarding the Hillary ClintonHillary Diane Rodham ClintonHillicon Valley: Trump's exclusive interview with Hill.TV | Trump, intel officials clash over Russia docs | EU investigating Amazon | Military gets new cyber authority | Flynn sentencing sparks new questions about Mueller probe READ: President Trump’s exclusive interview with Hill.TV Keeping up with Michael Avenatti 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.).