Appearing in the home state of South Carolina Sen. Lindsey Graham, who recently labeled Trump "a jackass," Trump claimed that Graham -- whom he called a "lightweight" and a "stiff" -- had once called him to ask for help secure appearances on FOX News.
Brandishing a piece of paper with a telephone number, Trump added: "So he gave me his number, and I found the card! I wrote the number down!"
"Let's give it a try," he suggested to the crowd, reading the number twice aloud to the audience.
Trump acknowledged that the number was several years old and might no longer be in service but added "I don't know, give it a shot."
.@CBSNews can confirm that the number Trump just read out on stage in South Carolina is Lindsey Graham's cell number.
— DJ Judd (@juddzeez) July 21, 2015