That prompted a statement from Biden campaign manager Jen O'Malley Dillion, who said: "If the president makes good on his threat to go to court to try to prevent the proper tabulation of votes, we have legal teams standing by ready to deploy to resist that effort".
"We knew because of the unprecedented early vote, the mail-in vote, that it was going to take awhile", Biden said.
President Donald Trump early Wednesday said he would take the election to the Supreme Court, although it was unclear what legal action he might pursue.
"We feel good about where we are, we really do".
Biden has captured 20 states including his home state DE and big prizes California and NY, as well as the U.S. capital.
"[Trump] still needs to win one of Michigan, Wisconsin or Arizona", he said.
"We are going to continue day and night until we get every one of those votes counted", Schmidt said.
Trump spent much of Wednesday in the White House residence, huddling with advisers and fuming at media coverage showing his Democratic rival picking up key battlegrounds.
Currently, the county is reporting more than 609,000 votes - 64% of those cast there - have been counted. Clinton also won the state in 2016.
Trump Backers Protest At Voting Center In Detroit
Trump's allies chanted, "Stop the count!" inside TCF Center, where ballots were being handled. Chris Michael, 40, from Gilbert, Arizona, said he came to make sure all votes are counted.
Our US partner, ABC News, is projecting Trump will take the key battleground of Florida as well as Texas.
Green said the gap between Mr Trump and Mr Biden was not large.
Trump and Biden were locked in tight races in battleground states across the country Tuesday night as they concluded an epic campaign that will shape America's response to the surging pandemic and foundational questions of economic fairness and racial justice. Election results for several states are not expected to come in until Wednesday morning or even later.
A simple majority of states, equivalent to 26 votes or more, would be needed to win. In 2000, a Supreme Court ruling on December 12 - two months and five days after Election Day - ended the Florida recount and awarded the presidency to Republican George W. Bush over Democrat Al Gore.
One group made a decision to temporarily stand down its plan to mobilize protests across the U.S. Wednesday, citing the unclear results of the election.
The president, who earlier in the day visited staff at his campaign headquarters in nearby Virginia, watched election returns with his family in the upstairs living room of the White House residence.
A tie has not been seen in modern times but the process was implemented in the 1800s, including in the election of 1800 between Thomas Jefferson and Aaron Burr.
Trump appeared to suggest those ballots should not be counted, and that he would fight for that outcome at the high court.
Voters, many wearing masks and maintaining social-distancing to guard against the spread of the coronavirus, experienced long lines in a few locales and short waits in many other places.