In an interview with POLITICO, Luntz said Trump — and Democratic presidential insurgent Bernie Sanders — are “delivering a big ‘f—- you’ to the elites in America.

“And that resonates on both sides,” Luntz said. “But ‘f—- you’ doesn’t solve anything. ‘F—- you’ doesn’t make life any better. ‘F—- you’ makes you feel good, but it doesn’t get you where you need to go. ‘F—- you’ doesn’t make America strong. ‘F—- you’ doesn’t solve anything.”

Trump responded by accusing Luntz of harboring a long-held vendetta because Trump refused to do business with Luntz’s polling firm.

“I caught him cold,” Trump told POLITICO. “And frankly, if I was [Fox News President] Roger Ailes, I’d fire that guy so fast for what he did that his head would spin.”