Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE's campaign manager, Robby Mook, on Sunday touted the Democratic presidential nominee's progress in the general election and predicted record turnout.

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"We feel very, very good about what we've seen so far," Mook said on "Fox News Sunday" when asked if he has a sense about what kind of strength Clinton has at this point in the election.

"We predict that this is going to be the biggest election in American history. More people are going to turn out than ever before."

Mook added that the campaign is encouraged by who is turning out to vote.

"We are very proud of the ground game that we've built. We see it delivering the results that we expected," Mook said.

"We believe over 40 percent of voters in the battleground states are going to turn out before Election Day. This election is happening as we speak, and that ground game is there pushing out people out."

But Mook said the campaign isn't taking anything for granted.

"This is not over yet, and battleground states are called battleground states for a reason," he said.

"That's because they're going to be close. We expect them all to be won or lost by a point or two."

He also defended the campaign's decision to go into traditionally red states but reiterated that the race is going to be "competitive up until the end."

"What I find very encouraging is we have seen, first a record in voter registration, over 200 million people across this country are now registered to vote, which is great," he said.

"And we're seeing record turnout numbers."