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.) will join at least four other Democratic presidential hopefuls on the debate stage in December after notching 4 percent in a new national poll released Sunday.

To make the December debate, candidates have to amass the support of at least 200,000 unique donors and register 4 percent or more in four qualifying polls or 6 percent in two approved early voting state polls.

Prior to Sunday, Harris had met the donor threshold, but remained one qualifying poll away. That changed, however, after an NBC News/Wall Street Journal survey released Sunday morning showed her at 4 percent, an analysis of donor and polling data shows.

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Ian Sams, a spokesman for Harris’s campaign, confirmed to The Hill that the California senator qualified for the December debate, which is set to take place in Los Angeles on Dec. 19.

So far, four other candidates have qualified for the December debate: 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, 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.), 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.) and 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.

The debate qualification is welcome news for Harris, who has struggled in recent months to maintain the momentum she gained after a standout performance in the first Democratic debate in June.

Her campaign announced last week that it would lay off some staff from its headquarters in Baltimore and redeploy others to Iowa, the first-in-the-nation caucus state that Harris is betting on to keep her 2020 ambitions alive.

The December debate could include significantly fewer candidates than other debates this year.

In addition to the five candidates who have qualified for the event, only two other candidates have met the 200,000-donor threshold set by the Democratic National Committee, Sen. Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.) and former tech executive Andrew Yang Andrew YangBiden's latest small business outreach is just ... awful Doctor who allegedly assaulted Evelyn Yang arrested on federal charges The Hill's Campaign Report: Biden weighs in on police shootings | Who's moderating the debates | Trump trails in post-convention polls MORE. Both still need to meet the polling requirement if they hope to be on the debate stage next month.

Rachel Frazin contributed.