Jeb Bush, among others, appears to have had his fill of Donald Trump.

After Trump gave out Sen. Lindsey Graham's phone number during a campaign stop Tuesday, fellow GOP presidential candidate Bush said enough.

After Graham, another GOP presidential candidate, called Trump "the world's biggest jackass" during a television interview, the billionaire developer read Graham's personal cellphone number and showed it to TV cameras at a campaign event. Graham joked that he would have to buy a new phone. His voicemail quickly filled up.

The back-and-forth is the latest chapter in an ongoing feud between Trump and those who criticize him. He is now at odds with much of the Republican establishment after a series of incendiary comments, topped by his weekend mocking of Arizona Sen. John McCain's experience as a tortured prisoner of war in Vietnam.

In a speech Tuesday to hundreds of supporters in Bluffton, South Carolina, Trump kept on McCain, accusing him of being soft on illegal immigration.

"He's totally about open borders and all this stuff," Trump said.

The real estate developer also went after others who have criticized him in recent weeks, implying that former Texas Gov. Rick Perry was unintelligent and Bush, the former Florida governor, weak.

Elsewhere in South Carolina on Tuesday, Bush, walked a fine line, criticizing his fellow candidate's rhetoric on immigration and McCain but saying Trump's supporters are "good people" with "legitimate concerns."

"I respect the sentiments people feel when they hear Trump talk. The problem with Mr. Trump's language is that it's divisive, it's ugly, it's mean-spirited," Bush told a gathering of Republican women in Spartanburg. "We have to separate him from the people that have legitimate concerns about the country."

Graham, appearing on "CBS This Morning" Tuesday, was more to the point.

"Don't be a jackass," Graham said. "Run for president. But don't be the world's biggest jackass."

He said Trump had "crossed the line with the American people" and predicted this would be "the beginning of the end with Donald Trump."

Information from the Associated Press was used in this report.