Hillary ClintonHillary Diane Rodham ClintonO’Malley tells Dems not to fear Trump FBI informant gathered years of evidence on Russian push for US nuclear fuel deals, including Uranium One, memos show Pelosi blasts California Republicans for supporting tax bill MORE admits in a new interview that she may have "missed a few chances" during her 2016 Democratic presidential bid.

In a preview of her first TV interview on her forthcoming book "What Happened," Clinton told CBS News' Jane Pauley about a moment in a presidential debate where she says President Trump made her uncomfortable on stage.

"While I'm answering questions, my mind is going 'OK, do I keep my composure, do I act like a president, am I the person that people can trust in the end to make hard decisions, or do I wheel around and say, 'Get out of my space, back up you creep!'" 

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"Well you know, I didn't do the latter," Clinton continued. "I think my composure, which I have developed over years being in the public eye, has well-equipped me for being a leader."

"I think in this time we're in, particularly in this campaign, you know maybe I missed a few chances," Clinton added in the interview, which is airing Sunday.

At the townhall-style debate, the candidates answered questions from the audience while walking around on stage instead of speaking from behind lecterns.

Clinton writes in her new book that Trump's attempts to "intimidate" her during the debate made her "skin crawl."