First presidential debate is underway.

Moderator Chris Wallace of Fox News kicks off by saying none of the questions were shared with the commission or either of the candidates.

Trump defends his move to speedily appoint a Supreme Court justice at this stage: "We won the election. Elections have consequences. We have the Senate. We have the White House. We have a phenomenal nominee."

Biden waits about a minute into the debate to make his first Obamacare mention. "He's in the Supreme Court now trying to get rid of the Affordable Care Act."

Joe Biden on Amy Coney Barrett (who hasn't yet been confirmed): "I'm not opposed to the justice. She seems like a very fine person."

He then notes Barrett's previous writings sympathetic to anti-ACA litigation.

Trump accuses Biden of supporting single payer. Biden does not. He notes that he doesn't and defeated Democrats who do in the primary. Trump says again that he and his party support it.

"That is simply a lie," Biden says.

Roe v. Wade "is also at stake now," Biden says.

Trump jumps in: "You don't know what's on the ballot. Why is it on the ballot?"

[INAUDIBLE CROSSTALK]