CNN

Another Donald Trump rally descended into violent chaos on Saturday night, as one protester was brutally beaten and Trump's own campaign manager was involved in an altercation.

A man with a sign that showed Trump's face and the words "Bad for America" was walking up the stairs at the event in Tucson, AZ when a man suddenly attacked him, kicking him and punching him repeatedly.

The man, Bryan Sanders, talked to NBC News about the incident. "What was going through my mind was: Put your arms over your head, because this political movement has gotten to the point where you may get beat to death inside of a rally," he said.

Meanwhile, Corey Lewandowski, Trump's campaign manager, was caught on tape manhandling another protester, grabbing his collar and jostling him around as security surrounded him.

Lewandowski was also caught grabbing former Breitbart reporter Michelle Fields earlier in the month; Fields subsequently resigned from the site after it refused to fully take her side against the Trump campaign.

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Trump has repeatedly brushed off any controversy surrounding Lewandowski, and on Sunday's "This Week," he denied that the Arizona incident had even happened.

"That was somebody else pulling him," he said.