Donald Trump joined Chris Wallace on "Fox News Sunday" and responded to Carly Fiorina's claim that he and Ben Carson pushed for the upcoming CNBC debate to be two hours and include opening and closing statements because they're worried about answering questions for three hours.

"Prepared statements are what politicians do," Fiorina said on "The Kelly File" last week. "Honestly, here are two outsiders, supposedly, Donald Trump and Ben Carson. They sound a lot like politicians tonight to me."

"Look, first of all, she’s going nowhere. You talk about dropping in the polls? She’s dropped like a rock," Trump said. "I could stand there for 12 hours. I could stand there for 20 hours. But the people can’t take it. Who wants to watch a debate for three hours? I couldn’t watch Hillary for an hour-and-a-half."

He said that CNBC wanted to make the upcoming debate three hours to make more money for the network, so he threatened that he wouldn't participate.

CNBC agreed Friday to Trump's demand that the debate be two hours and include opening and closing statements.

Wallace noted Trump's many back-and-forths with the media and fellow candidates and asked if the GOP front-runner is "a little thin-skinned."

"I’m not thin-skinned when something is truthful," Trump said. "If I did something wrong and you said I did something, I can handle that."

"It's when people hit me when I didn't do anything wrong. Then it's not a question of thin-skinned, I will fight back."

Watch part of the must-see "Fox News Sunday" interview above.

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