Joe Biden says he is on course to win a "clear majority" in the US presidential election.
As counting continues, the Democratic candidate claimed he had already got a "mandate for action".
Mr Biden believes he can take most of the remaining battleground states to push him above 300 Electoral College votes.
He admitted the process of calling a result "moves very slow" but urged for an end to "partisan warfare", urging Americans to "remain calm, patient and let the process work out".
Mr Biden is leading in four of the six states yet to declare - Arizona, Georgia, Nevada and Pennsylvania.
He only needs the latter's 20 Electoral College votes to add to his existing 253 to push him over the 270 line that will guarantee him the keys to the White House.
In a statement, Donald Trump says he's now contesting "the entire election process" in legal proceedings.
President Trump, who is ahead in North Carolina and Alaska, is ramping up unsubstantiated and contested claims the election was rigged against him.
"I had such a big lead in all of these states late into election night, only to see the leads miraculously disappear as the days went by," he tweeted.
"Perhaps these leads will return as our legal proceedings move forward!"
Senior Republicans have stepped in to warn that the baseless allegations of mass fraud will lead to "destructive and dangerous passions" running high, and urged for vote counting to continue.
Yesterday, Mick Mulvaney, President Trump's former chief of staff and US special envoy in Northern Ireland, said that Donald Trump may run for the White House again in 2024 if he loses this year's election.
Meanwhile, the President's chief-of-staff has tested positive for coronavirus.
Mark Meadows frequently appeared at public events without wearing a face covering - including President Trump's election night party.
Additional reporting by IRN