Hunter Rivera, the 24-year-old chairman of the Weld County Republican Party, was one of two men arrested Thursday on suspicion of trying to buy sex from Larimer County Sheriff's Office investigators who posed as minors as part of an operation targeting child predators. After news of Rivera's arrest broke late Friday, multiple prominent Republicans denounced Rivera and called for his immediate resignation from the party position. The sheriff's office said in a news release that "several dozen people" responded to investigators who posed as minors offering sexual acts for sale on local websites and online forums.