Republican presidential front-runner Donald TrumpDonald TrumpThe Memo: The Obamas unbound, on race Iran says onus is on US to rejoin nuclear deal on third anniversary of withdrawal Assaults on Roe v Wade increasing MORE is not backing down from his claim that “thousands of people” in Arab communities in New Jersey were cheering on 9/11.

Trump defended himself by telling an NBC News reporter that he has "the world’s greatest memory" and that everybody knows that.

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The billionaire real estate mogul insisted that his claims were right and touted the support he received on Twitter. 

“He was adamant,” NBC News reporter Katy Tur told MSNBC after a lengthy phone call with Trump. 

Trump said Monday that he wants apologies from those who doubt his recollection of the 9/11 terrorist attacks.

“I want an apology,” he tweeted. "Many people have tweeted that I am right.”