The US mid-term election campaign is entering a frenzied final day in a vote seen as a verdict on Donald Trump's presidency.
The opposition Democrats are hoping to retake control of the House of Representatives, while Republicans seek to tighten their grip on the Senate.
Turnout is expected to be high, with more than 34 million Americans already having voted in the election.
Both Donald Trump and Democrat Barack Obama rallied supporters on Sunday.
"You gotta get to the polls on Tuesday, and you gotta vote," Mr Trump said in Macon, Georgia. "The contrast in this election could not be more clear."
In recent days Mr Trump has ramped up his rhetoric on issues like immigration, accusing Democrats of wanting to "erase America's borders" at a rally in Tennessee.
Meanwhile, former President Obama, who has been campaigning for Democratic candidates, urged Americans not to succumb to hostility and division.
"We have seen repeated attempts to divide us with rhetoric designed to make us angry and make us fearful," he said in Miami, Florida.
"But in four days, Florida, you can be a check on that kind of behaviour."
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Mr Trump continues campaigning in Ohio and Indiana on Monday, before making a final stop in Missouri.