The Nazi flag was ripped away almost immediately by irate Sanders supporters at the event in the Veterans Memorial Coliseum in Phoenix on Thursday evening. Eyewitness footage shows the crowd reacting quickly and forcibly to the appalling act. Were he to be elected, Sanders would become the first Jewish president of the United States.

The white man in a white t-shirt who was responsible for the incident was unceremoniously kicked out of the event and he was recorded racially abusing Bernie supporters outside the arena a short time later.

The stunt was made particularly egregious by the fact that the Vermont senator lost relatives in the Holocaust. Sanders did not notice the flag during the event, but was informed afterwards, and was reportedly “disturbed by it,” according to campaign spokesman Mike Casca.