Democratic presidential candidate Joe Biden said the results of the election may not be known until Wednesday morning or later but he is optimistic of the outcome.
Biden, who is locked in a tight race against Republican President Donald Trump, took to the stage at the outdoor venue in Wilmington, Delaware, along with his wife Jill.
"We knew this was going to go long, but who knew we would go into maybe tomorrow morning, maybe even longer!" he said.
"But we feel good about where we are. I'm here to tell you tonight we believe we're on track to win this election."
"It ain't over until every vote, every ballot is counted."
13 killed in explosion at Qatar's Ras Laffan LNG site
UK PM Starmer says he will resign
Fire at coaching centre in India's Lucknow kills at least 15
Temperatures to exceed 40C in European heatwave as three die in France
US, Iran conclude high-level talks in Switzerland, mediators say
