“As president, you would change your tone?” Cooper asked.

“Oh, I’d think so,” Trump said. “I’ll change my tone.”

Trump defended his recent attacks on his fellow candidates, saying he has been hitting back because he was first provoked.

“I didn’t start it with Lindsey Graham. I couldn’t care less about Lindsey Graham. He’s registered at I think zero in the polls,” Trump said. “Lindsey Graham called me a jackass. So am I supposed to say, ‘Oh, it’s OK’? I’m called a jackass. You have to fight back.”