Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE's campaign is fundraising off polls that show her lead over Republican presidential nominee Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE has evaporated.

"I'm pointing this out because it's part of a broader trend," Clinton campaign manager Robby Mook wrote in an email to supporters of the presumptive Democratic presidential nominee about the polling.

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"Poll after poll is showing that Trump has been eating away at our lead, and after his convention, he's erased it entirely," Mook added.

While the campaign aide argued they expected "some of that," as candidates traditionally get a bounce after their conventions, "that doesn't make these next few weeks any less critical."

The fundraising appeal asks for supporters to pitch in $1 for Clinton's campaign. A button in the email directs viewers to the campaign website where amounts range from $5 to $500.

The subject line of the email reads: "Trump 44, Clinton 39." Trump topped Clinton, 44 percent to 39 percent, in a four-way match-up with third-party candidates, according to a CNN/ORC poll released Monday.

Trump has overtaken Clinton in the RealClearPolitics polling index, the first time the businessman has led the former secretary of State in the polling index since May.

"With the polls leaning in the wrong direction, your contribution has never been more critical," Mook wrote.

Democrats have fretted over several new polls that show Trump with a healthy bounce following last week's Republican National Convention. Democrats are holding their convention this week.