The memo was authored by some of Trump’s pollsters and data gurus just five days before the vote. Days earlier, Comey had reopened his investigation after FBI agents found additional emails on a laptop belonged Anthony Weiner, the now estranged husband of Clinton’s longtime aide Huma Abedin. While polling began to swing towards Trump, virtually all prognosticators still had Clinton heading for a comfortable win on November 8. On the Trump campaign, however, Green writes that “it was suddenly clear” that the investigation “was roiling the electorate.”

“The last few days have proven to be pivotal in the minds of voters with the recent revelations in reopening the investigation of Secretary Clinton,” the memo read, according to Green. “Early polling numbers show declining support for Clinton, shifting in favor of Mr. Trump.”

It added: “This may have a fundamental impact on the results.”