Donald Trump on Tuesday gave what is likely to be an incredibly controversial speech during a campaign-style rally in Phoenix, Arizona.

Thousands of protestors gathered outside during the event, despite the president’s claims there were not a lot of people rallying against him. Shortly after Trump departed the stage, police in Arizona deployed “chemical weapons” against protestors who shouting, “this is not a riot.”

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Watch below:

Police are gassing the crowd and running in. People are screaming “This is not a riot!” pic.twitter.com/1vgZVwBmbF — Hunter Walker (@hunterw) August 23, 2017

Protesters are still being gassed here. pic.twitter.com/RPwF4jB1TW — Hunter Walker (@hunterw) August 23, 2017

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Police are deploying chemical weapons against protesters outside Trump’s Phoenix rally pic.twitter.com/Afqr3q04ni — Brandon Wall (@Walldo) August 23, 2017