Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) raised more than $25 million over the past three months, his presidential campaign said Tuesday, eclipsing his fundraising total from the second quarter of the year.

Sanders’s $25.3 million haul was fueled by some 1.4 million donations and bolstered by a strong final day of fundraising on Monday, which the campaign said was its second-best day for donations since its launch in February.

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The staggering third-quarter total, the highest reported by any Democratic presidential hopeful so far this year, could help give Sanders a boost at a time when he has seen his support in the polls wane. His chief progressive rival, Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.), has risen in recent surveys.

The latest cash haul brings the Vermont senator’s total fundraising for the year to $61.5 million, the campaign said, which does not include an additional $2.6 million transferred from other campaign accounts.

“Bernie is proud to be the only candidate running to defeat Donald Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE who is 100 percent funded by grassroots donations – both in the primary and in the general,” Faiz Shakir, Sanders’s campaign manager, said.

“Media elites and professional pundits have tried repeatedly to dismiss this campaign, and yet working-class Americans keep saying loudly and clearly that they want a political revolution.”

The average donation in the third quarter was $18.07, according to Sanders’s team, which added that more than 99.9 percent of his donors had not yet hit the maximum contribution amount of $2,800, meaning they can give again.

Sanders’s $25.3 million third-quarter haul surpassed at least one of his rivals for the Democratic presidential nomination. South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE’s campaign announced early Tuesday that he had raised roughly $19.1 million in the last three months, short of the $24.8 million he raised in the second quarter.

Meanwhile, Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.) raised $11.6 million for her presidential bid, while another Democratic hopeful, Sen. Cory Booker Cory Anthony BookerThe movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump 3 reasons why Biden is misreading the politics of court packing MORE (D-N.J.), said on Monday that he had raised more than $2 million in the last 10 days of September.

Booker had previously warned that he would exit the presidential race if he did not raise at least $1.7 million by the end of the month. He has not yet disclosed his full third-quarter fundraising haul.

No other candidate has released fundraising totals yet for the third quarter, which spans from July 1 to Sept. 30. Campaigns have until Oct. 15 to file their fundraising and spending reports with the Federal Election Commission, though many candidates are expected to release fundraising totals beforehand.

Sanders’s latest fundraising total is a marked improvement over his second-quarter fundraising. Between April 1 and June 30, he brought in roughly $18 million, putting him behind three other candidates, Buttigieg, Warren and former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE.

Sanders has seen his standing in national and early state polls slide in recent months as Warren has gained ground on both him and Biden, the contest’s ostensible front-runner. Sanders’s allies have dismissed the downturn, pointing to his fundraising efforts — he has received contributions from over 1 million individual donors — as evidence that he still has momentum in the race.

Like Warren, Sanders has eschewed the kind of high-dollar fundraisers typical in presidential campaigns, and has instead powered his campaign with small-dollar, online donations and what he has dubbed “grassroots fundraisers,” events with relatively low ticket prices and supporters of all means are invited.

Sanders’s fundraising surge came at a time in the campaign season when the pace of donations typically slows down. Donors tend to focus less on the campaign in the summer months, particularly in July and August, because of vacations and the extended congressional recess.

— Updated at 4:22 p.m.