(Bloomberg) -- Three Democratic candidates say they will skip the Democratic debate next week if food service workers at the site carry through with a promised picket line.

Senators Elizabeth Warren and Bernie Sanders and entrepreneur Andrew Yang all tweeted Friday that they will not show up for a debate at Loyola Marymount University in Los Angeles on Thursday.

The debate had been slated for UCLA’s Luskin School of Public Affairs. But the DNC asked the debate’s media sponsors to find an alternative location because the American Federation of State, County and Municipal Employees asked the candidates to boycott it over a contract dispute involving patient care workers.

The DNC did not immediately respond to a request for comment.

Warren praised the UNITE HERE labor union for “fighting for better wages and benefits” for food service workers at the university.

“The DNC should find a solution that lives up to our party’s commitment to fight for working people,” she wrote. “I will not cross the union’s picket line even if it means missing the debate.”

Sanders also said he stood with the workers, who are currently fighting with Sodexo, a contractor that handles food services at the Jesuit university. The local union has been in negotiations with Sodexo since March for a collective bargaining agreement.

“I will not be crossing their picket line,” he tweeted.

Yang made the same pledge. “We must live our values and there is nothing more core to the Democratic Party than the fight for working people,” he tweeted.

The Democratic National Committee moved the debate to Loyola Marymount in early November after a similar union dispute at the University of California at Los Angeles.

(Michael Bloomberg is also seeking the Democratic presidential nomination. Bloomberg is the founder and majority owner of Bloomberg LP, the parent company of Bloomberg News.)

To contact the reporter on this story: Ryan Teague Beckwith in New York at rbeckwith3@bloomberg.net

To contact the editors responsible for this story: Wendy Benjaminson at wbenjaminson@bloomberg.net, Mark Niquette

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