Democratic vice presidential nominee Tim KaineTimothy (Tim) Michael KaineGraham would consider US-Russia military coordination in Syria Dem infighting erupts over Supreme Court pick Election Countdown: Latest on the 2018 Senate money race | Red-state Dems feeling the heat over Kavanaugh | Dem doubts about Warren | Ocasio-Cortez to visit Capitol Hill | Why Puerto Ricans in Florida could swing Senate race MORE said Sunday that FBI Director James Comey's letter to lawmakers regarding the Hillary ClintonHillary Diane Rodham ClintonWhite House protests extend into sixth day despite rain Clinton: US is 'losing friends and allies' under Trump Justice Dept releases surveillance applications for former Trump aide 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.).