Roughly 19 million Americans have participated in early voting, according to the University of Florida's United States Election Project, which comprises about 20 percent of the electorate.

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The survey was conducted before news emerged Friday that the FBI was reviewing new emails that director James Comey said may pertain to his agency's investigation into Clinton's private email server.

Comey announced in July that he would not recommend criminal charges over the mishandling of classified information surrounding Clinton's use of the server as secretary of State.

The new emails were discovered during a separate investigation into former Rep. Anthony Weiner (D-N.Y.) regarding an online relationship with an underrage girl, The New York Times reported.

Clinton has hosted numerous early voting rallies in multiple key battleground states in the past week, including Florida and North Carolina. Trump also made campaign stops in Florida this week.

The Democratic presidential nominee has more than a 95 percent chance of winning the 270 electoral college votes necessary to win the the White House, according to Reuters' survey.

Twenty states are "solidly for Clinton" in this week's poll, which is down five from the 25 states for Clinton last week. Despite the decrease in states for Clinton, no new states have shifted solidly to Trump.

Updated: 2:59 p.m.