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AP Photo Trump comes out swinging, rival by rival

That didn't take long.

Within minutes of the second primetime GOP primary debate, Donald Trump was already tearing into his GOP rivals, and as the night wore on, trained his focus in particular on Jeb Bush.

Bush, he charged, is "weak on immigration, by the way he's in favor of Common Core, he's weak on immigration, he doesn't get my vote."

He also jabbed at Bush over remarks he once made questioning how much to invest in women’s health issues, comments that Bush later walked back.

“It’s a terrible statement, it’s going to haunt him, absolutely,” Trump said. “I heard him, I was watching that, I said ‘wow, I can’t believe it.’ I will take care of women. I respect women.”

The stage was set for conflict from the beginning, when CNN debate moderator Jake Tapper asked Carly Fiorina whether she would trust Trump with the nuclear codes. Fiorina demurred-- but Trump jumped in, and in defending himself, dished out a swipe at Sen. Rand Paul, who had raised such concerns.

Paul "shouldn't even be on the stage," Trump said.

Paul decried Trump's habit of engaging in personal attacks, leading Trump to question the Kentucky senator's looks.

Previously, Trump said, he had refrained from criticizing Paul's appearance, but "believe me, there's a lot of subject matter right there."

The next tussle involved Wisconsin Gov. Scott Walker, who tried to question Trump's gravitas.

Trump immediately shot back that Walker was destroying his home state's economy and plummeting in the polls in Iowa.

And in addition to outright attacks, Trump also dripped with condescension when he addressed Bush.

"More energy tonight, I like that," said Trump, who has gotten under the former Florida governor's skin with his constant digs at Bush's supposed "low energy" on the campaign trail.

One candidate who escaped largely unscathed: Carly Fiorina. After making fun of her "face" in an interview last week, Trump sought to clarify on the debate stage, "I think she's got a beautiful face."

