Police used pepper spray on protesters who were outside of GOP frontrunner Donald Trump’s campaign rally Saturday night in Kansas City, Missouri.

Police use pepper spray on crowd outside Trump appearance in Kansas City https://t.co/Pml6R9YtN1 pic.twitter.com/KN1MoqDMfg — The News & Observer (@newsobserver) March 13, 2016

Trump called for protesters inside his rally, who were continuously interrupting his speech, to be arrested. Police arrested four people, according to ABC News.

“We’re going to take our country back from these people,” Trump said. “These are bad, bad people.”