Could Donald Trump Comments on Autism Hurt Him?

ABC News' Jon Karl with Post GOP Debate Politics.
3:29 | 09/18/15

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Transcript for Could Donald Trump Comments on Autism Hurt Him?
We begin with the race for president. "Your voice, your vote," Donald Trump and the other candidates facing new scrutiny and tough questions after that big debate. ABC's Jon Karl starts us off. Good morning, Jon. Reporter: Good morning. Wednesday's debate was another blockbuster, nearly 23 million viewers, but now Donald Trump is under fire this time not for something he said but for something he didn't say. Back on the campaign trail in New Hampshire, Donald Trump was feeling the heat. This room is hot. The air-conditioning was not designed for this many people. Reporter: But while taking questions from a packed audience of die-hard supporters, trump may have stepped into a firestorm. -- Problem in this country. It's called muslims. We know our current president is one. You know he's not even an American. The birth certificate question -- But anyway, we have training camps growing where they want to kill us. That's my question. When can we get rid of them? Reporter: He let that slide. We'll be looking at a lot of different things and a lot of people are saying and a lot of people are saying that bad things are happening out there. We'll be looking at that and plenty of other things. Reporter: Hillary Clinton was quick to pounce tweeting Donald Trump not denouncing false statements about the president and hateful rhetoric about muslims is disturbing and just plain wrong, cut it out. Meanwhile, the gop front-runner took more shots at Carly fiorina, the breakout star from Wednesday night's debate. You know what a leader does, they challenge the status quo, they solve problems that have festered for a long time. Reporter: Trump says he wasn't impressed. Everyone said she made a good speech yesterday. I don't get it. I don't get it. Reporter: Trump also stirred new controversy at the end of Wednesday's debate by linking childhood vaccines to autism. And we've had so many instance, people that work for me just the other day, 2 years old, 2 1/2 years old, a beautiful child went to have the vaccine and came back a week later got a tremendous fever, got very, very sick, now is autistic. Now, the association of the -- American academy of pediatricians says that trump's statements on vaccines are irresponsible and untrue and disproven. As for those comments in response to that question, George, the trump campaign says that trump was reacting to what that person said about training camp, terrorist training camps, not what he said about muslims or the president. Right, he was answering the question about training camps. Thanks them. Matt dowd, 23 million people watched that. How has the race changed? Fascinating, one, we know the ennice yachl of people involved out in the country want to take turns in this. The newest twist and turn is the Carly and Donald show but a race between Carly fiorina and Donald Trump and the vetting of each other business's record in the course of this. I think this is an interesting time for Donald Trump. He's never faced a public battle with a woman like this before, unless divorce papers were involved, that he's had to deal with somebody that's confronting him on a number of issues. A quick-thinking 10-year-old and the driver actnio to save all the children on d.ar how the gotveery eon out Sa ly. Fe a Whanda wit is fldh.in Peyton manning leang tdihe Denver broncos in a crazy comeback marching his team down the field scoring twice in just nine seconds for the dramatic victory.

This transcript has been automatically generated and may not be 100% accurate.

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