Clashes between protesters and supporters of President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick 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.

Breaking: outside Minneapolis Trump rally. Protestors lighting Maga hats on fire. Rushing police. Calling them pigs, etc. Escalating scene. pic.twitter.com/HxUFzs8OWF — Matt Finn (@MattFinnFNC) October 10, 2019

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.