Republicans vowed on Sunday to send an "alert" to US President Joe Biden and restore Congress in the US midterm elections, while Democrats insist they are still in the fight with a day left.
After the rallies organized by the two parties Saturday in Pennsylvania, Biden visited New York, and former US President Trump visited Miami to mobilize supporters, while senior party leaders resorted to radio stations to encourage Americans to vote heavily.
Biden and Trump are playing two major roles in attracting voters to the polls in next Tuesday's elections, which the US president said represented a "decisive" moment for American democracy.
40 million Americans voted early, NBC News reported, with both sides expecting to win.
Republican Senate National Committee Chairman Rick Scott predicted a "great night" in the House and Senate.
Recent opinion polls have also put Democrats on the defensive.
Republican Governor Glenn Youngkin of Virginia told ABC News' This Week that his camp is now "one who provides reasonable solutions" to pressing issues such as high inflation and crime.
"It would be a wake-up call for President Biden," he added.
As Trump ramped up conspiracy theories about voting for the midterm elections and many of his party's candidates cast doubt on upcoming results, party leaders sought to reassure voters that Republicans would accept the result, even if they lost.
In response to a direct question whether every Republican candidate would accept the results, no matter what, Republican National Committee chairwoman Ronna McDaniel told CNN they would "accept it."
Hundreds of Republicans seeking to win next week have embraced Trump's unfounded allegations of fraud in the 2020 election.
There are Republicans who cast doubt on the results of the midterm elections.
Carrie Lake, the party's far-right candidate for governor of Arizona, declined to say whether she would honor the results.
When asked by CNN last month if she would accept the result of the vote, she replied, "I will win the election, and I will accept the result."
Democrats rejected the premise of inescapable Republican control of Congress.
"We're going to keep that majority," Democratic Congressman Sean Patrick Maloney told NBC, noting that Biden has been unfairly blamed on inflation while taking little credit for successes like job growth.
Opinion polls suggest Democrats have struggled to convince voters of the day-to-day concerns central to this week's election, and there is no evidence that Biden's warnings about the threat to democracy have turned the tables in their favour.
Addressing thousands of people in Philadelphia, Biden cited Trump supporters' growing support for conspiracy theories to shed light on what's at stake.
"This is a defining moment for the nation," Biden said, seeking to give his party a boost to its run to the finish line.
And last week, former US President Donald Trump again questioned the mechanisms of American democracy, and launched accusations that elections in the swing state of Pennsylvania were being rigged.