In a final burst of campaigning, US President Donald Trump and his Democratic challenger Joe Biden have criss-crossed Midwestern states that may hold the keys to the White House.
Mr Biden went on the offensive in Iowa, a state that voted for Mr Trump by 10 points in 2016.
Mr Trump made a play for Minnesota, which voted narrowly for Hillary Clinton four years ago.
Mr Biden holds a solid national lead ahead of Tuesday’s general election.
But his advantage over Mr Trump is narrower in the handful of US states that could vote for either candidate and ultimately decide the outcome in four days’ time.
More than 85 million people have voted early, 55 million of them by post, setting the US on course for its biggest voter turnout in over a century.