(CNN) Elizabeth Warren's presidential campaign is set to announce on Friday that it has received more than 1 million donations this election, according to a forthcoming email to supporters shared with CNN.

The news comes on the heels of the Massachusetts Democrat announcing a significant fundraising haul of more than $19 million for the second quarter, and just days ahead of the second Democratic presidential debate in Detroit next week hosted by CNN. It will bolster the argument that the Warren team's big bet on small-dollar and grassroots fundraising is working -- the senator has vowed not to solicit money from wealthy donors, including in phone calls and fundraisers, during the primaries.

In the thank you and fundraising email, Warren's campaign manager Roger Lau touts what he calls a "100% people-powered campaign," and writes that the more than million donations is "exciting proof of the momentum that we see on the ground across the country."

"We just passed our one-millionth donation to this campaign -- it came from Caitlyn, an ESL teacher from Tennessee," Lau writes. "That's one million donations solely from grassroots donors. That means zero from closed-door fundraising events. Zero from Washington lobbyists. Zero from corporate PACs, or PACs of any kind."

The Warren campaign has previously said that some 384,000 people donated to the campaign in the second quarter.

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