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WASHINGTON — NBC’s Chuck Todd tussled with Donald Trump Sunday over the billionaire’s claims that Arab-Americans celebrated 9/11— chiding him that, “truthfulness matters.”

On “Meet the Press” Trump again insisted he saw celebrations in New Jersey following the terrorist attacks– despite no video coverage backing up that claim and police denying it happened.

“I saw it. So many people saw it, Chuck. So why would I take it back, I’m not going to take it back,” Trump said.

Todd pounced: “Just because somebody repeats something doesn’t make it true. And I guess, that’s actually, that’s the worst — ” Todd said shaking his head with a look of disgust.

Trump cut in to say people were saying in Sarasota, Florida over the weekend they were in New Jersey at the time also saw Arabs cheering the deadly terrorists attacks.

“People were saying,” Todd chimed in. “Mr. Trump, if I said, “Well people have said, Mr. Trump is not worth $10 billion and people were saying …’ you would say that was crazy. You wouldn’t make a business deal based on retweets and based on hearsay. You’re running for president of the United States. Your words matter. Truthfulness matters. Fact-based stuff matters, no?”

“Take it easy. Chuck, just play cool.” Trump retorted.

“I have a very good memory, Chuck.,” Trump added. “… I saw it somewhere on television many years ago and I never forgot it.”

Trump also insisted he has insider knowledge that President Obama intends to to bring 200,000 refugees to the US despite public claims of 10,000.

On 9/11 claims, Trump has cited a Washington Post article from Sept. 18, 2001 that said police in New Jersey were questioning people who allegedly were celebrating on rooftops and with tailgate parties. The author, Serge Kovaleski, has disputed Trump’s assessment that “thousands and thousands” were cheering.

Trump retaliated against Kovaleski at a rally last week by apparently mocking his disability, which has impaired his arm movements. Trump has denied his gyrations were intended to mock the reporter.

Carly Fiorina blasted Trump for mocking Kovaleski. “Apparently Donald Trump only feels big when he’s trying to make everyone else look small. Of course in the end, he looks the smallest of all,” the GOP presidential contender told Fox News Sunday.

She, too, has been made fun of her physical looks by the billionaire businessman.

“The pattern is he says something insulting, offensive, outrageous,” Fiorina told Fox News Sunday. “The media pays attention and he claims we all misunderstood him. The media pays attention again. This is the pattern perhaps of an entertainer. It’s certainly not the pattern of a leader.”

Jeb Bush Sunday said he doubts Trump could be commander-in-chief.

“If you listen to him talk, it’s kind of scary to be honest with you, because he’s not a serious candidate,” the former Florida governor told CBS’ “Face the Nation. “He doesn’t talk about the issues at hand that are of national security importance for our country. To keep us safe is the first priority of the president. And he’s all over the map, misinformed at best and preying on people’s fears at worst.”

Meanwhile Ohio Gov. John Kasich upped his attack this week on Trump with a web ad that compares the reality TV star’s “dangerous rhetoric” to the rise of Adolf Hitler.

In the ad, a Kasich supporter, Vietnam veteran Col. Tom Moe, says people might not care that Trump wants to register Muslims, round up immigrants and rough up black protesters — because they might not be Muslim.

“But if he keeps going and he actually becomes president he may get around to you and you better hope that there’s someone left to help you,” Moe said, paraphrasing the anti-Nazi words of German pastor Martin Niemoller.