Protesters clash with Trump supporters outside Minneapolis rally

Clashes between protesters and supporters of President TrumpDonald John TrumpPence: It's not a "foregone conclusion" that lawmakers impeach Trump FBI identifies Pensacola shooter as Saudi Royal Saudi Air Force second lieutenant Trump calls Warren 'Pocahontas,' knocks wealth tax MORE were reported outside the Target Center in Minneapolis where the president gave a rally on Thursday night.

USA Today reported that urine was thrown in the streets and police eventually had to use pepper spray to subdue the crowd. 

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Protests began hours before Trump took the stage, according to USA Today, as various advocacy groups gathered across the street from the venue. 

Fox News reporter Matt Finn tweeted that protesters had also burned Trump's signature "MAGA" hats. The video he posted shows a small fire being extinguished by police, though it is not immediately clear whether it contained "MAGA" hats. 

Meanwhile, Jenna Johnson, a correspondent with The Washington Post, tweeted a video of a clash outside the center. She wrote in the tweet that it was protesters attacking a man leaving the Trump rally whom somebody had identified as a Nazi.