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Because the police immediately arrested the protester instead of his attacker in jaw-dropping footage revealed by Daily Star Online.

In the video, the presidential hopeful can be seen holding forth as four anti-Trump activists argue with fellow spectators in the stands.

Pretty soon police are beckoning the group from their seats, winning a cheer from the crowd - but they will not be allowed to leave peacefully.

(Image: YOUTUBE) (Image: YOUTUBE/GETTY)

Because as they approach the exit, a Trump supporter sucker punches one of the men right in front of their police escorts.

And then – disgracefully – the cops wrestle the protester to the floor and appear to arrest him, dragging him outside.

The video was filmed yesterday at a rally in Fayetteville, North Carolina, where Trump received a standing ovation.

But local media reported that the event at Crown Coliseum was marked by protests, with cops separating supporters and activists.

In the past, Trump has defended attacks on people protesting his rallies, even admitting in Las Vegas to wanting to throw a punch himself.

And when an activist was set upon by several attackers at the billionaire's event in Birmingham, Alabama, he said it might have been deserved.

The Republican hopeful told Fox News in November: “Maybe he should have been roughed up, because it was absolutely disgusting what he was doing."

North Carolina will pick its nominee for president in a primary on March 15.

According to news station ABC11, Trump told the crowd those protesting were "professional troublemakers".

He also said: "We win, win, win. We will win with the military, knock the hell out of ISIS, win with the vets take care of our great veterans, and win at the border."