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.

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