Hillary Clinton will not speak tonight about the result of the US election.
With Republican candidate Donald Trump seemingly closing in on victory, Ms Clinton's campaign manager John Podesta addressed her campaign rally in New York.
Mr Trump has just arrived at his own election headquarters and is likely to speak soon.
Mr Podesta emphasised that several seats were still close and said Ms Clinton would not be making any statement tonight.
"It's been a long night and it's been a long campaign, but I can say, we can wait a little longer can't we?" Mr Podesta said.
"They're still counting votes and every vote should count.
"I want every person in this hall and everyone across the country who supported Hillary to know that your voices and your enthusiasm means so much to her and to Tim and all of us."
Mr Trump seems almost certain to win the presidency. CNN has him leading Hillary Clinton by a wide margin, with 247 electoral votes to 215.
Fox News reported earlier that Republican House Speaker Paul Ryan had already called Mr Trump to congratulate him on his win.
But Mr Podesta's speech leaves open the possibility that Ms Clinton will refuse to concede defeat, even if Mr Trump claims victory.