Early voting results in key swing states reveal where some states might fall, the Associated Press reported.
With more than 5.3 million votes already cast, Trump is doing well in Ohio, Iowa and Georgia, according to the AP analysis.
Clinton has several key pick-ups in Florida, North Carolina and Maine, but her campaign has transitioned to focusing on Arizona, which has voted Republican since 2000 and carries 11 electoral votes.
The latest ABC News tracking poll released Sunday morning also showed Clinton with a double-digit lead over Trump.
The survey of 1,391 people, conducted Thursday through Saturday, gave Clinton a 12-point edge over the Republican candidate and revealed a shift in voter preferences among several demographics.
Clinton leads Trump by 20 percent among women, and 32 percent among college-educated white women, according to the report. Clinton also is leading among men, 44 to 41 percent.
