'My skin crawled' when Donald Trump stood behind me - Hillary Clinton

Hillary Clinton has revisited last year's presidential battle with Donald Trump in her upcoming book, discussing their first meeting after his 'grab 'em by the pussy' remarks were leaked.

Ms Clinton faced off with Mr Trump for the second presidential debate on October 9 - just two days after a tape was uncovered in which he discussed grabbing women by their genitals.

In a recently released excerpt of the book, entitled What Happened, Ms Clinton says she felt "incredibly uncomfortable" during the debate, and claims she considered confronting Mr Trump about how closely he was trailing her as she spoke.

"This is not OK, 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," she wrote.

"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."

Ms Clinton admitted feeling unsure of how to conduct herself, and considered lashing out at him verbally before deciding on "biting [her] tongue" and "digging [her] fingernails into a clenched fist".

"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.'"

What Happened comes out on September 12, and promises to provide a never-before-heard insight into the 2016 presidential race.