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There was real news out of Tuesday’s debate. Here’s what you need to know about it.

Donald Trump, left, and Jeb Bush, right, both speak as Ted Cruz looks on during the CNN Republican presidential debate at the Venetian Hotel & Casino on Tuesday, Dec. 15, 2015, in Las Vegas. (AP Photo/John Locher)

LAS VEGAS -- In between the predictable repetition of talking points and rehearsed attacks, there was actually some news in tonight's Republican presidential debate. Here's a closer look:

1. Donald Trump said he would support the Republican nominee, even if that person is not him. 

Presidential candidate Donald Trump reiterated his controversial stance on immigration and sparred with rival Jeb Bush during the fifth Republican debate. (Video: Deirdra O'Reagan/The Washington Post)

"Are you ready to assure Republicans tonight that you will run as a Republican and abide by the decision of the Republicans?" asked co-moderator Hugh Hewitt.

"I really am. I'll be honest, I really am," replied Trump.

He later added: "I will tell you, I am totally committed to the Republican Party. I feel very honored to be the front-runner."

There's been some uncertainty about whether Trump might run as a rogue third-party candidate if his front-running bid for the Republican nod collapses. For now at least, he's put those uncertainties to rest. That's not to say that he might not change his mind in the future, as he has done on other things. But for now, it's welcome news for Republican Party officials nervous about the prospect of Trump running as an independent.

2. Ted Cruz said definitively that he opposes a path to citizenship or legal status for illegal immigrants. 

Cruz has hit rival Marco Rubio for supporting what he calls "amnesty," but he has sidestepped questions about whether he supports a path to citizenship or legal status for the nation's 11 million undocumented immigrants. (He even released a recent plan that didn't address the matter.)

“I have never supported legalization, and I do not intend to support legalization,” Cruz said, going further than he has before.

After the debate, Cruz campaign chairman Chad Sweet told reporters that Cruz "unequivocally does not support legalization."

What is his plan for the 11 million living in the country?

"Attrition through enforcement," said Sweet.

3. Trump appeared to be completely unfamiliar with the "nuclear triad."  

Asked by Hewitt what his priority is among the nuclear triad -- which refers to submarines, long-range missiles and bombers, each a means of launching a nuclear attack  -- Trump appeared not to understand.

First, he gave a lengthy answer on nuclear proliferation. Then, Hewitt pressed him to identify his priority.

"I think, for me, nuclear is just the power, the devastation is very important to me," responded Trump.

To make things worse for him, Sen. Marco Rubio (Fla.) then said: "First, let's explain to people at home who the triad -- what the triad is. Maybe a lot of people haven't heard that terminology before." And then he did.