Protesters celebrate after successfully stopping Donald Trump from speaking at a scheduled campaign rally at the UIC Pavillon in Chicago due to security reasons.
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"I would hope my supporters will not disrupt meetings," Sanders said. "We have millions of supporters, and people do things. But it was not our campaign."

Republican and Democratic presidential candidates from both parties have condemned the recent uptick in violence at Trump events. Ohio Gov. John Kasich and Sens. Marco Rubio, R-Fla., and Ted Cruz, R-Texas, have said that Trump is partially to blame for creating a toxic atmosphere at his rallies.

"This is now multiple rallies where people are assaulted and beat up, where a guy gets sucker punched by one of the Trump supporters, and then instead of condemning it, Trump is silent," Rubio said on "State of the Union." "I mean he (Trump) has turned the most important election in a generation into a circus, into a complete fiasco and a carnival."

Rubio warned that Trump’s rhetoric and actions at his campaign events may encourage someone who is mentally ill to act dangerously.

"Maybe you think it’s a joke, but there are people out there that are not balanced," he said. "There are people out there that are not completely in control of themselves and they hear something like this from a leader, you don’t know what they’re going to do next. And when someone is seeking a position of leadership and is already is in a position of influence, you speak responsibly."

Trump dismissed Rubio’s complaints.

"In Florida, we have a man, Marco Rubio, who doesn't even show up to vote in the U.S. Senate," Trump said on CNN Sunday. "He's a disgrace. He's weak, very weak on illegal immigration, wants to give amnesty to everybody. He's a person that I don't think he could be elected dogcatcher in Florida, frankly…"

William Douglas: 202-383-6026, @williamgdouglas