It was unclear whether Clinton could convert into electoral gain the announcement on Sunday (Nov 6) that the FBI had cleared her again of wrongdoing over her email use.
Ms Clinton’s popularity had dipped after FBI Director James Comey dropped a campaign bombshell eight days earlier with a reopened inquiry into whether she exposed US secrets by using a private email server while serving as secretary of state.
Opinion polls had tightened as Mr Trump began to recover ground lost while battling accusations of sexual assault, and the race looked headed for a photo finish.
Final voting takes place today, US time. It will at mid-morning Wednesday, Thailand time. A winner will not be known before late Wednesday morning, Thailand time.
Mr Trump, the billionaire Republican contender, who has whipped up a populist grassroots movement among largely white male voters, landed in Sarasota, Florida on yesterday’s final day of electioneering.
After a stop there, the 70-year-old was due to fly to rallies in North Carolina, Pennsylvania and New Hampshire, before ending with a late event in Michigan.
In Virginia on Sunday, he stoked supporters at a post-midnight rally with stock attacks on his rival, branding her the “most corrupt candidate ever to seek the office of the presidency”.
Mrs Clinton, 69, had events planned through midnight last night, with stops in Pennsylvania, Michigan and North Carolina.
Her Sunday rallies had a note of optimism.
“I want each and every one of us to think for a moment about how we would feel on Nov 9, if we were not successful,” she said in Manchester, New Hampshire
“When your kids and grand-kids ask you what you did in 2016 ... I hope you’ll be able to say you voted for a better, stronger, fairer America.”
Mr Trump is predicting a ballot upset on par with Britain’s shock vote to quit the European Union, or what on Sunday he called: “Brexit plus, plus, plus.”
He has repeatedly condemned Ms Clinton’s “criminal scheme” and argued that she’s unfit to be president.