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Trump blasts Diller on Twitter, calls him 'sad and pathetic'

Barry Diller
David A. Grogan | CNBC

Should Donald Trump's presidential run prove successful, Barry Diller is liable to do something desperate.

"If Donald Trump doesn't fall, I'll either move out of the country or join the resistance," Diller said Tuesday. "I just think it's a phenomenon of reality television as politics and I think that that is how it started."

Trump responded over the weekend via Twitter, calling Diller "sad and pathetic" on the social media platform.

Front-running Trump provokes strong reactions from foes and supporters alike.