Before outgoing Democratic National Committee Chair Debbie Wasserman Schultz even opened her mouth to address the Florida delegation at a Monday breakfast event, supporters of Vermont Senator Bernie Sanders conveyed that they're not screwing around.

As she approached the podium, many rushed toward her and booed the South Florida Congresswoman. Police had to form a wall around her.

Amid intense booing they held signs that read "emails" and shouted things like "you're ruining democracy!"

It was impossible to hear what was said by the controversial figure, who leaked emails recently proved was showing a preference in the primary battle between Sanders and presumptive Democratic nominee Hillary Clinton.

Supporters also flocked to the front of the room to defend her.

"She's talking about a kid that was killed last night!" shouted a man.

One man rolled his eyes at that and offered a look of indifference.

The booing and shouts of "shame" continued for several minutes, until she left the stage.

It's unclear whether the fracas, which took place Monday morning — the first day of the event — will set the tone for the Democratic National Convention, which begins Monday evening and runs through Thursday.

University of South Florida political analyst Susan MacManus said the event, unlike anything she's seen in recent memory, may set the tone for the convention of a party that just started the day with some bad news for their presumptive nominee.

“It's never a great thing when you lead off your convention expecting to be unified, to see this...on the first day,” she said. “And it certainly doesn't help matters that a poll came out this morning showing that Trump got a significant convention bump and is now ahead of her in national polls. Florida delegates here are devastated but also suspicious of the timing of the leaks.”

Sanders delegates were rumored to be discussing their plan for the floor of the convention Monday morning.

But MacManus said if the events of last week's Republican National Convention are any indication, a rough moment or two of party infighting may not, ultimately, be a bad omen.

“But the good news for them is, I think that the same thing happened at the Republican convention and they have seemingly gotten together," she said. "The common theme through both of these conventions has been party unity. Both parties have known from the get-go that there are key elements of their base that just had to be convinced to vote for their party nominee.”