Donald Trump fired off new personal insults in the first round of last night's debate but turned sheepish when called out for disparaging remarks about his female opponent's looks.

With no apparent provocation, Trump veered off into an attack on Sen. Rand Paul of Kentucky during a round of questioning on whether he could be trusted with the nation's nuclear arsenal.

"Well, first of all, Rand Paul shouldn't even be on this stage. He's number 11, he's got 1 percent in the polls, and how he got up here, there's far too many people anyway."

Paul doubted Trump's fitness for nuclear command and said, "his visceral response to attack people on their appearance -- short, tall, fat, ugly -- my goodness, that happened in junior high. Are we not way above that?"

Trump shot back: "I never attacked him on his look, and believe me, there's plenty of subject matter right there."

Later, Trump stuck to his story that he was talking about businesswoman Carly Fiorina's "persona," not her look, when a Rolling Stone profile described him as saying about her: "Look at that face. Would anyone vote for that?"

Fiorina, asked about the remarks, used another Trump comment as a comeback. On the stage, he had just ripped former Florida Gov. Jeb Bush for trying to walk back comments on funding women's health care.

"Mr. Trump said that he heard Mr. Bush very clearly in what Mr. Bush said. I think women all over this country heard very clearly what Mr. Trump said," she said, drawing loud applause from the live audience.

Trump said, "She's got a beautiful face, and she's a beautiful woman."

Fiorina did not smile at the compliment.

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At another point, Bush said Trump should apologize for remarks alluding to Bush's Mexican-born wife as affecting his views on immigration. "I won't do that, because I've said nothing wrong," Trump replied, adding: "But I do hear she's a lovely woman."