She said the FBI's investigation was taken seriously "from the beginning."

Her defense come after Clinton campaign chairman John Podesta blasted the FBI in an op-ed last week. In the piece, he wrote he was surprised to read in The New York Times that the FBI didn't properly warn DNC officials about Russian hacks in 2015.

Lynch said she couldn't comment on Podesta's remarks, but noted he isn't involved in the ongoing investigation.

"So he wouldn't be privy to everything that would have been done or said to that," she said. "But as I said, he's entitled to his opinion."

Podesta on Sunday escalated tensions, saying the FBI didn't tell him about Russia hacking into his email account until two days after WikiLeaks started publishing the stolen messages.

He also suggested the email hacks could have been an attempt to distract people from the release of the 2005 "Access Hollywood" tape, in which Trump was heard making lewd comments about women.

"On Oct. 7, the Access Hollywood tape comes out. One hour later, Wikileaks started dropping my emails into the public. One could say those things might not have been a coincidence," he said.

"Two days later, the FBI contacted me, and the first thing the agent said to me was, 'I don't know if you're aware but your email account may have been hacked.'"

Podesta also refused to say Sunday if the election was "free and fair." The Russians "clearly intervened" in the race, he said, and cited the recent report suggesting there is a consensus among members of the intelligence community that Russia intervened to help Trump.

"I think it was distorted by the Russian intervention," Podesta said on NBC's "Meet The Press," when pressed on whether it was a free and fair election. "Let's put it that way."

Still, members of Trump's campaign are refusing to accept the reports from the intelligence community.

Incoming chief of staff Reince Priebus on Sunday said the intelligence community hasn't been clear and cast blame on Democrats for continuing to raise these issues in an attempt to delegitimize the election results.