Celebrations in the US as Biden pledges to be president 'for all Americans'

As his supporters rejoice across the U.S, Democrat Joe Biden pledges to be a "president for all Americans" after defeating Republican incumbent Donald Trump in their election. "The work ahead of us will be hard, but I promise you this: I will be a President for all Americans -- whether you voted for me or not," the 77-year-old former vice president says in a tweet.