Former President Bill ClintonWilliam (Bill) Jefferson ClintonDemocrats' choice: Unite or go down to defeat Biden says he has to do 'really well' in South Carolina Klobuchar says English should not be US national language, reversing from prior vote MORE did not mince his words when Bernie SandersBernie SandersDemocrats redefine center as theirs collapses Speculation swirls around whether Bloomberg will make Las Vegas debate stage Pelosi: 'I'm not counting Joe Biden out' MORE supporters heckled him during a campaign event for Hillary ClintonHillary Diane Rodham ClintonThe 'Palmetto Promise': South Carolina will decide the race Alabama Senate contender hits Sessions in new ad: 'Hillary still ain't in jail' Worries grow as moderates split Democratic vote MORE

“If I were them, I’d be screaming too because they know they will be toast by election day,” Clinton said, according to a Fox News reporter at the event.

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Bill Clinton was in East Los Angeles on Sunday campaigning ahead of the California primary on Tuesday. 

The former secretary of State is in a tight race there with the Vermont senator.