BLUFFTON, S.C. — Donald Trump pushed back ever harder Tuesday against Republicans fed up with his provocations, disclosing one opponent’s cell number in a fiery speech and lashing out at an influential newspaper as part of an in-your-face escalation of the feud.

Fellow GOP presidential contender Sen. Lindsey Graham called him a “jackass,” only to see floods of Trump supporters jam his phone line after Trump read Graham’s number to an audience.

Trump 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.

Since then the real estate developer and reality TV host has intensified his criticism of McCain and his record on veterans issues in the Senate, even as politicians from both parties and veterans groups have rushed to McCain’s defense.

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