All seven Democratic candidates who qualified for next week's presidential debate in Los Angeles are threatening to skip it over a labor dispute at the university hosting the event.

The candidates said Friday that they won't attend the Dec. 19 event due to a dispute between workers at Loyola Marymount University and food services company Sodexo.

Sens. 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.) and Bernie Sanders Bernie SandersTrump, Biden will not shake hands at first debate due to COVID-19 Sanders tells Maher 'there will be a number of plans' to remove Trump if he loses Sirota reacts to report of harassment, doxing by Harris supporters MORE (I-Vt.), the 2020 field's progressive heavyweights, were among the first to say they would boycott the event.

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They were soon joined by former Vice President Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE, 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.), 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 (D), and businessmen 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 and Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE.

"The [Democratic National Committee] should find a solution that lives up to our party's commitment to fight for working people," Warren tweeted.

.@UniteHere11 is fighting for better wages and benefits—and I stand with them. The DNC should find a solution that lives up to our party's commitment to fight for working people. I will not cross the union's picket line even if it means missing the debate. — Elizabeth Warren (@ewarren) December 13, 2019

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I stand with the workers of @UniteHere11 on campus at Loyola Marymount University fighting Sodexo for a better contract. I will not be crossing their picket line. — Bernie Sanders (@BernieSanders) December 13, 2019

I won't be crossing a picket line. We’ve got to stand together with @UniteHere11 for affordable health care and fair wages. A job is about more than just a paycheck. It's about dignity. https://t.co/nn4tb5q8wt — Joe Biden (@JoeBiden) December 13, 2019

I take the debate stage to stand up for workers’ rights, not to undermine them.



I stand in solidarity with the workers of @UNITEHERE11 at Loyola Marymount University and I will not cross their picket line. — Pete Buttigieg (@PeteButtigieg) December 13, 2019

The debate had been moved to Loyola Marymount University from the University of California, Los Angeles due to a separate labor dispute.

The union representing the workers, Unite Here Local 11, had said in a statement earlier Friday that "the leading contenders for the Democratic nomination will be greeted with picket lines at their replacement venue."

A Democratic National Committee (DNC) spokesperson told The Hill in a statement that it had learned of the issue Friday and was working to find a solution.

“While LMU is not a party to the negotiations between Sodexo and Unite Here Local 11, Tom Perez Thomas Edward PerezClinton’s top five vice presidential picks Government social programs: Triumph of hope over evidence Labor’s 'wasteful spending and mismanagement” at Workers’ Comp MORE would absolutely not cross a picket line and would never expect our candidates to either,” spokesperson Xochitl Hinojosa told The New York Times, referring to the DNC's chairman.

“We are working with all stakeholders to find an acceptable resolution that meets their needs and is consistent with our values and will enable us to proceed as scheduled with next week’s debate,” she added.