Millions of Americans will vote in the midterm elections on Tuesday, with the balance of power in Congress at stake.
The entire US House of Representatives, about a third of the Senate and key state governorships are up for grabs.
President Joe Biden, a Democrat, and ex-President Donald Trump, a Republican, made their closing arguments in competing rallies.
Mr Biden’s ability to pass laws will be stymied if Republicans take the House, as most projections expect.
Democrats currently control the White House and – by razor-thin margins – both chambers of Congress.