As she visited North Carolina, Clinton urged her supporters to participate in early voting.
"From now until Nov. 5, you can vote early at any voting location in your county. And you know, this is a big deal," Clinton said at a campaign event in Raleigh.
Campaigning in Naples, Florida, on Sunday, Trump also encouraged voters to go to the polls to vote both for him and Republicans running for Congress and other offices.
"You have 16 days to make this happen, but you have to get out and vote, and that includes helping me re-elect Republicans all over the place."
"I hope they help me too. Be nice if they help us too, right?" said Trump, who has sparred with many prominent members of his party, including U.S. House of Representatives Speaker Paul Ryan, the country's top elected Republican.
The latest Reuters/Ipsos poll released on Friday had Clinton leading Trump by 4 percentage points, and the most recent State of the Nation project showed Clinton with a 95 percent chance of winning the 270 Electoral College votes needed to secure the presidency. [
An ABC News poll released on Sunday morning had Clinton leading with 50 percent of likely support, compared with Trump's 38 percent. The poll found that the number of Republicans who said they were likely to vote fell 7 percentage points from mid-October.