Former DNC head Donna Brazile, in her upcoming memoir, reveals the thought process she went through after hearing of Hillary Clinton's health scare just two months out from the 2016 election, resulting her desire to replace the Democratic nominee with then-Vice President Joe Biden.

The incident which sparked these doubts happened outside of a Sept. 11 memorial event in New York City from which she had departed early. Video shows her losing her balance and her aides quickly swarming in and helping her into her campaign van.

Her campaign blamed the episode on Clinton feeling "overheated," and her doctor revealed a diagnosis of pneumonia. Still, at the time there was talk of some sort of cover-up of Clinton's health issues.

Ultimately, Brazile did not make a formal move against Clinton. “No matter my doubts and my fears about the election and Hillary as a candidate, I could not make good on that threat to replace her,” she writes, according to a preview from the Washington Post.