President Joe Biden reacted to the debate in a post on X early Wednesday morning.

"America got to see tonight the leader I've been proud to work alongside for three and a half years. Wasn't even close," he said.

Biden was in New York City during the debate and will be attending the 9/11 memorial services at Ground Zero later in the day.

A majority of debate watchers think Harris won the debate against Trump, according to a poll taken by CNN and SSRS after the debate.

On who won the debate, 63% of debate watchers said Harris and 37% said Trump.

The poll has a margin of error of +/- 5.3% points.

CNN said that before the debate, respondents were split 50%-50% on who would win.

In June, their instant poll found that among debate watchers, 33% thought Biden won and 67% thought Trump won.

-ABC News' Oren Oppenheim

Harris put Trump on the defensive early on, claiming viewers were "going to hear from the same old, tired playbook, a bunch of lies, grievances and name-calling." She later took digs at his rallies and was the first to bring up his multiple indictments.

Meanwhile, Trump tried to tie Harris to President Joe Biden as often as he could. "She is Biden," he said as he criticized their economic record.

Harris' gender was not broached during the debate, though her race was. Trump doubled down on false claims about her racial identity, though he said he "couldn't care less."

Read more about the debate highlights here.

During the Harris-Trump face-off, both candidates tried to score points by slinging barbs at each other.

Here are some of their sharp jabs:

Trump: “Wait a minute, I'm talking now, if you don't mind, please. Does that sound familiar?”

Harris: “Donald Trump was fired by 81 million people.”

Harris: “He talks about fictional characters like Hannibal Lecter.”

Read more zingers here.

Fact Check: True

Earlier this year, a bipartisan group of senators unveiled a $20 billion plan to substantially bolster security along the U.S.-Mexico border. It would have added hundreds of border patrol and ICE agents and asylum officers; funded construction of new border wall; expanded detention facilities; ended “catch and release;” effectively closed the border entirely when illegal crossings surge; and raised the bar for asylum claims. (Source: text of bill

The influential Border Patrol union, which has previously endorsed Trump, publicly backed the bill. But hours after the draft legislation was unveiled on Feb. 5, Trump urged his party to oppose the bill, even as many Republicans have spent years lobbying for some of the security measures included in the deal.

“I’ll fight it all the way,” Trump told supporters at a Las Vegas rally Feb. 8. “A lot of the senators are trying to say, respectfully, they’re blaming it on me. I say, that’s okay. Please blame it on me.”
Trump openly invoked election-year politics as a motivation for his position: “This Bill is a great gift to the Democrats, and a Death Wish for The Republican Party. It takes the HORRIBLE JOB the Democrats have done on Immigration and the Border, absolves them, and puts it all squarely on the shoulders of Republicans,” Trump wrote on social media. The bill failed a key Senate procedural vote in May, with all but one Republican voting against it, including all those involved in crafting the deal.