First audio excerpts from Hillary Clinton's upcoming book 'What Happened'

Clinton shares her thoughts on events like the October debate when Trump stood uncomfortably close to her.
2:32 | 08/24/17

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Transcript for First audio excerpts from Hillary Clinton's upcoming book 'What Happened'
We are turn next to the first audio excerpts from Hillary Clinton's new book titled "What happened." She said she let millions of Americans town, and she writes about when Donald Trump appeared to hover behind her. Clinton writes about the choice she says she had to make in that moment. Here tonight, ABC's Mary Bruce. Reporter: In her new book, Hillary Clinton offers a candid view of what it was like to run against Donald Trump. Writing this wasn't easy. Reporter: As she now watches his presidency play out on the news, Clinton says she let down millions of her. Americans. Every day that I was a candidate, I knew millions of people were counting on me, and I couldn't bear the idea of letting them down, but I did. I kwont get the job done, and I'll have to live with that for the rest of my life. Reporter: Clinton questioned that second debate when trump hovered behind her. This is not okay, I thought. It was the second presidential debate, and Donald Trump was looming behind me. Two days before, the world heard him brag about groping women. Now we were on a small stage and no matter where I walked, he followed me closely, staring at me, making faces. It was incredibly uncomfortable. He was literally breathing down my neck. My skin crawled. Reporter: She writes she had a choice. Do you stay calm, keep smiling and carry on as if he weren't repeatedly invading your space, or do you turn, look him in the eye and say loudly and clearly, back up, you creep? Get away from me. I know you love to intimidate women, but you can't intimidate me, so back up. Reporter: She chose to say nothing, and now wondering if that was the right choice. Maybe I have overlearned the lesson of staying calm, biting my tongue, digging my fingernails into a clenched fist. Smiling all the while, determined to present a composed face to the world. And Mary Bruce with us live tonight from Washington, and Mary, Hillary Clinton will reveal a lot about the unexpected moments along the way, but she also reveals some of the high notes of her campaign? Reporter: She also details some of those moments sheps to remember forever. Her young granddaughter racing into the room as she was practicing her convention speech, and what it was like to deliver that speech and become the first woman ever nominate

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

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