In a fundraising email sent Wednesday from the Democrats' campaign arm, Pelosi said she's "worried" and "disgusted" by the presumptive Republican presidential nominee.

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She's calling for "serious help from grassroots Democrats to stop him and the Republicans" in November.

Translation: send money.

"He’s a formidable candidate — and a serious threat to our country," Pelosi said on behalf of the Democratic Congressional Campaign Committee (DCCC). "It’s up to us to make sure Trump doesn’t become our next President."

The message is a reflection of several unusual dynamics surrounding this year's election. First, Trump's combative and unorthodox campaign has been wildly successful in ways that few had predicted a year ago, and Democrats are being careful not to underestimate his popular appeal — particularly since the wealthy businessman has done well in attracting Independents and some blue-collar Democrats.

A Harvard University poll last week found that 53 percent of young voters disapprove of her. That's led to concerns that Clinton simply won't draw Democratic voters to the polls in the numbers party leaders had initially hoped, hurting Democrats up and down the ballot. Presenting Democrats with the threat of Trump, then, might counteract any potential enthusiasm gap and increase voter turnout.

And third, if Democratic leaders appear too confident in having Trump at the top of the ticket, potential donors might wonder why there's any reason to give to the party at all. A drop in fundraising could hurt not only the Democrats' presidential odds, but also their chances of taking back the Senate and picking up House seats. That lends party leaders an incentive to exaggerate the threat Trump presents — at least for fundraising purposes.

"I’m worried," Pelosi said in the DCCC email. "And I’m ready to fight back."

Wednesday's email blast is not the first time Pelosi has gone after Trump this year. In March, she attached her name to a similar DCCC fundraising plea, warning that Trump's primary wins were "a jarring wake up call" for Democrats.

And later that month, she issued a statement attacking Trump's remarks — since retracted — that women who get abortions if the procedure were illegal should receive "some form of punishment."

But those statements have been rare, and for the most part Pelosi has demurred when asked about the presumptive GOP nominee. Visiting Mexico City this week, for instance, she tried repeatedly to steer reporters' questions away from Trump, and she rejected the notion that Trump's hardline immigration positions — which have included calling Mexican immigrants rapists and other criminals — have harmed U.S.-Mexico relations.

"No. Someone respond in Spanish. No," Pelosi said tersely, when asked of potential damage.

After two other Democrats briefly weighed in, Pelosi added, "That's the last thing we're going to say about Donald Trump."

When the Trump questions kept coming, Pelosi again downplayed any diplomatic threat his campaign might pose.

"The occasional reference to what was happening in the presidential election in the United States is not the purpose of our visit and occupied not that much of our time," she said.

"However, I have to admit: It did come up. And our response has been what you have heard from my colleagues: This election will come and go, and so will Donald Trump."