Donald Trump Gives Out Lindsey Graham’s Cell Phone Number

— -- It’s officially war between Republican Presidential contenders Donald Trump and Lindsey Graham.

Just hours after South Carolina Sen. Lindsey Graham called Donald Trump a “jackass,” Trump retaliated by reading Lindsey Graham's cell phone number into the microphone during a speech in South Carolina on Tuesday.

“[Graham] said, 'Can you mention my name?' I say, 'Yes I will.' And he gave me his number,” Trump said. “And I found the card. I wrote the number down. I don't know if it's the right number. Let's try it.”

Trump then read the number — which a representative from Graham’s Senate office confirmed to ABC News is Graham’s cell phone.

“I don’t know — it’s three or four years ago — maybe it’s an old number,” Trump continued. “Your local politician: He won’t fix anything, but he’ll still talk to you.”

A call to the number from ABC News went unanswered: it rang once before hitting an automated voicemail box. A woman’s voice says the mailbox belongs to Lindsey Graham, but the mailbox was full.

Graham has since tweeted out that he's "probably getting a new phone."

Trump also called Graham an “idiot” and a “lightweight,” adding that he “doesn’t seem like a very bright guy.” Graham had labeled Trump a "jackass" on CNN on Monday night and on CBS This Morning on Tuesday.

The real estate mogul was kicking off his campaign in South Carolina — Lindsey Graham’s home state and the third state in the primary and caucus process.

Graham’s campaign quickly released a statement: “Because of Trump's bombastic and ridiculous campaign, we aren't talking about Obama's horrible deal with Iran or Hillary Clinton's plans to continue Obama's failed national security agenda,” said Christian Ferry, Graham’s campaign manager.

And though Sen. John McCain has resisted responding further to Trump’s attack on his status as a war hero since calling on him to apologize to veterans on Monday, the Arizona senator did crack a joke Tuesday when asked about Trump calling Graham an “idiot."

“Well I think he called me a dummy, it is dummy and idiot,” McCain jokingly told ABC News' Jonathan Karl. “And the two of us are together again.”

McCain has endorsed Graham in his bid for the White House.