A Johnson City man, 71 year old Gary Clifford was charged with aggravated assault after he allegedly threatened another person with a knife Thursday.A release from the Johnson City Police Department (JCPD) states officers responded to an address in the 100 block of W Millard St. after receiving calls regarding a trespasser. A caller had reportedly told officers about a “dispute between two people” and wanted one of the people removed. When officers arrived, they found that the “dispute had escalated.”