Story highlights The video features clips of violence and a bloodied police officer

It was originally posted last week by an account named "trumpeffect"

(CNN) Donald Trump on Monday tweeted a video that features clips of anti-Trump protests, violence and a bloodied police officer before a dramatic narration intones: "We're at war."

MAKE AMERICA GREAT AGAIN!https://t.co/4uWRyTeEr3 — Donald J. Trump (@realDonaldTrump) April 4, 2016

The video, which a Trump supporter originally posted on Twitter, splices a clip of a gun firing into the air with footage from a canceled Trump rally in Chicago during which fistfights broke out between Trump supporters and protesters.

There has never been a report of a gun being fired in connection with a Trump rally or protests.

"We're at war. No one wants to admit it but humanity is under attack," the narrator, whose voice can be recognized as that of actor Martin Sheen, says over rolling clips of protests. "One very specific man might be all that stands between humanity and the greatest threat of our brief existence."

The narration is pulled from Sheen's voice-overs for the video game Mass Effect 2.

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