Who should pick the next president of the United States? Not “billionaires in wine caves,” says Elizabeth Warren.

That expression from the Massachusetts senator during Thursday night’s Democratic presidential debate in Los Angeles was a direct shot at Pete Buttigieg’s recent fundraiser held in a Napa Valley, Calif., wine cellar. Her attack drew a barbed response from the South Bend, Ind., mayor in one of the most fiery moments of the seven-candidate debate.