President Trump urged Georgia’s lead elections investigator to “find the fraud” in a lengthy December phone call, saying the official would be a “national hero,” according to an individual familiar with the call who spoke on the condition of anonymity because of the sensitivity of the conversation.

Trump placed the call to the investigations chief for the Georgia secretary of state’s office shortly before Christmas — while the individual was leading an inquiry into allegations of ballot fraud in Cobb County, in the suburbs of Atlanta, according to people familiar with the episode.