LAS VEGAS — Donald Trump's debate-eve presidential campaign rally here Monday night grew tense at several points when protesters interrupted his remarks and commotions erupted in the crowd.

In some instances, there were chaotic physical confrontations.

The first interruption came when a Trump supporter brought on stage was in the midst of explaining how his son was killed by an illegal immigrant.

"That's why we need gun control!" a man in the crowd shouted in protest.

Then, a brief tumultuous period ensued, and supporters tried to drown out protests with chants of "Trump! Trump! Trump!"

Later, after another disturbance, Trump paused his talk about the campaign to comment on the protests.

"Do I hear some noise over there? Yes, I do," Trump said. Then he waved in the direction of the protest and said, "Bye-bye."

Republican presidential candidate Donald Trump speaks at a Las Vegas rally on Dec. 14. (John Locher/AP)

Trump mocked the media for turning their attention to the protests, a line he regularly uses.

"They only turn when there's a protester," Trump said.

From the designated media work area, which is surrounded by barricades and which is where the campaign requires reporters to remain during events, altercations within the crowd could be heard.

BuzzFeed reporter McKay Coppins posted brief videos on Twitter of security personnel seeking to physically remove individuals who appear to be protesters.

In one exchange, several men are seen trying to remove a man on the ground who is yelling. "Light the m----------r on fire!" another man is heard saying in that video, though it is not completely clear from the footage who is speaking at whom.

It wasn't clear whether local police, hotel security or other officers were responsible for removing protesters. A campaign spokeswoman did not immediately respond to a question about the matter.

Other reporters tweeted videos, pictures and recaps of what they described as tense physical exchanges involving some combination of protesters, Trump supporters and security.

Trump will stand at the center of the stage Tuesday night at a prime-time televised debate hosted by CNN and Facebook, by virtue of his lead in the polls.

"We have a big night tomorrow," Trump said.

In his remarks, Trump largely revisited the themes he has touched on repeatedly during campaign, including deporting illegal immigrants, having a stronger presence on the global stage and recent polls in which he performed well.

“The American Dream is dead," said Trump near the end of his remarks. "But we’re going to make it bigger and better and stronger than ever before.”