Hillary Clinton’s campaign manager Robby Mook is running a video warning supporters not to get over confident about the presidential race, citing Donald Trump’s comments about polls.

“Donald Trump has been going around telling people not to listen to the polls, and saying that he can still win this race,”Mook says in the video. “Well you know what he’s absolutely right.”

Mook says that although Clinton has “the wind at her back” polls were beginning to show a tighter race.

“We’ve seen polls tighten since the last debate, and we expect things to get even closer by election day,” he said.

Mook urged all Clinton supporters to get out and vote through early voting, absentee ballots, and signing up to vote on election day.

“Donald Trump could win this election,” he warned.

Mooks tone is strikingly different, after the campaign signaled to media outlets that they were preparing to win big. They leaked plans to campaign in traditionally Republican stronghold states like Arizona and sent staffers in Utah.

“We want to win by as a large a margin as we can,” Clinton spokesman Brian Fallon told ABC News. “Then I think we want to build on that to try to get things done,” he said.