Donald Trump reveals GOP rival's personal phone number during live speech

Republican presidential candidate Donald Trump revealed GOP rival and US Sen. Lindsey Graham's (R-South Carolina) personal cell-phone number, in apparent retaliation for Graham calling the real-estate mogul a "jackass."

Trump shot back at Graham, calling him an "idiot" during a speech in the senator's home state of South Carolina. A few minutes later, he took out a card on which he said Graham had written his cell-phone number a few years ago.

He told the audience to "give it a shot."

Graham's campaign that the phone number belonged to the senator. The number went straight to voicemail.

Trump and Graham have been feuding publicly for the past few weeks. Graham recently took a dig at Trump in an interview with Business Insider, referencing one of the businesses that severed ties with Trump in the aftermath of his controversial comments on immigrants.

In an interview with CBS on Tuesday morning, Graham told Trump to "stop being a jackass."

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