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Sen. Amy Klobuchar echoed that sentiment, saying, “I don’t believe we should cross the picket line. So I encourage the DNC to try to work this out and find a new location.”

Loyola Marymount University is the second venue where the event is slated to take place. In November, the DNC announced it was no longer hosting the primary debate at the University of California, Los Angeles as originally planned, over a labor dispute between the university and a different local union.

\"In response to concerns raised by the local organized labor community in Los Angeles, we have asked our media partners to seek an alternative site for the December debate. We will be in touch with more information when it is available,\" the DNC wrote in an email informing the campaigns.

ABC News' Zohreen Shah contributed to this report.

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