When moderator Dionna Langford mentioned Hillary Clinton at the end of the discussion – raising her recent statement that “nobody likes Sanders” – the audience began to boo.
Langford attempted to quiet then down, saying: “We’re not gonna boo, we’re not gonna boo. We’re classy here.”
But Ms Tlaidb jumped in, saying: “I’ll boo. Boo,” as her fellow panellists began laughing.
“You all know I can’t be quiet,” Ms Tlaib added. “The haters will shut up on Monday when we win.”
She later rowed back with a Twitter statement, saying: “I am so incredibly in love with the movement that our campaign of #NotMeUs has created. This makes me protective over it and frustrated by attempts to dismiss the strength and diversity of our movement.
“However, I know what is at stake if we don't unify over one candidate to beat Trump and I intend to do everything possible to ensure that Trump does not win in 2020. In this instance, I allowed my disappointment with Secretary Clinton's latest comments about Senator Sanders and his supporters get the best of me.
"You all, my sisters-in-service on stage, and our movement deserve better."
It happened during Mr Sanders’ first ‘Caucus Concert’ ahead of Monday’s Iowa Caucuses.
The event was mainly taken up with discussions of progressive issues such as climate change, but it ended with the discussion of Ms Clinton because of her recent negative comments about Mr Sanders, in which she said: “Nobody likes him, nobody wants to work with him, he got nothing done.”
Ms Clinton has also refused to confirm whether she will endorse and campaign for him if he wins the Democratic nomination.
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