Video from outside of Donald TrumpDonald John TrumpO’Malley tells Dems not to fear Trump Right way and wrong way Five things to know about the elephant trophies controversy MORE's rally in Kansas City, Mo., shows at least five police officers using pepper spray against protesters. 

Trump has been under fire this week for the escalating violence between his supporters and anti-Trump protesters. 

Kansas City Police reported that they used pepper spray twice at the event.