It looks like Donald Trump has become the most caustic and bombastic presidential candidate.

(AP Photo/John Locher, File)

That was a role most thought would go to Gov. Chris Christie.

Aside from Trump's controversy questioning whether Sen. John McCain (R-AZ) was a Vietnam War hero, Trump got into a verbal war with fellow GOP candidate, Sen. Lindsey Graham (R-SC).

Graham started it by referring to Trump as a jackass. Trump responded by calling Graham an idiot, then held up a sign with Graham's personal cell phone number.

Trump continues to lead all GOP polls for president. He is the only candidate above 20 percent.

Previous front-runner Jeb Bush is barely in double digits.