President Joe Biden fumbled his way through Thursday nights presidential debate with Donald Trump, an alarming performance for Democrats eager to see him shut down his deeply flawed GOP challenger: a twice-impeached convicted felon known for his lies and ugly attacks.

The beginning of the 90-minute debate was particularly brutal for Biden. His voice was scratchy and weak, and sometimes hard to understand. He appeared to lose his train of thought multiple times, including in response to a question from a moderator, CNNs Jake Tapper, about the national debt. He struggled to answer another question about how his administration would strengthen health care, mixing up trillions with billions when talking about dollar amounts.

Bidens response became so disjointed that he ultimately pivoted and, just before his mic was cut off, he confusingly declared, We finally beat Medicare. He was presumably referring to his administration lowering the cost of prescription drugs under Medicare, but that victory something he could have touted in that moment was not at all articulated in what he said.

Visually, Biden didnt come across as particularly energized, either. The side-by-side images of him and Trump on TV often showed the president looking out with a fixed gaze, his mouth slightly open. Trump, meanwhile, was more animated and spoke forcefully, even as many of the things he was saying were false or wildly distorted.

Bidens campaign was clearly scrambling in response to what was happening. Over the course of the debate, the campaign sent out at least 11 emails attacking Trumps lies at the lectern. While it is standard practice for a campaign to send press releases on major talking points during a debate, many of them seemed to clarify Biden stances for issues on which he had stumbled responding to questions, including abortion rights and support for Black communities.

About halfway through the debate, the campaign told reporters that the presidents voice was raspy because he has a cold . They could have shared this detail ahead of the debate as a way to lower the bar for the presidents performance, but they did not.

Seasoned political observers were struck by Bidens performance. Amy Walter, the editor-in-chief of Cook Political Report, which forecasts election outcomes, speculated that the odds of Biden agreeing to a second debate in September are close to zero about now. MSNBC anchor Nicolle Wallace reported that conversations were happening within Bidens inner circle during the debate that ranged from whether he should be in this race tomorrow morning to what was wrong with him.

Even Kate Bedingfield, who was Bidens White House communications director from 2021 to 2023, said the debate was a disaster.

It was a really disappointing debate performance from Joe Biden , Bedingfield said in a statement . I dont think theres any other way to slice it. His biggest issue was to prove to the American people that he had the energy, the stamina and he didnt do that.

Democrats were certainly hopeful that Biden would outshine Trump given how strong he was in his State of the Union address in March. But Thursdays debate is going to revive concerns that are already circulating about his age and mental acuity, something hes faced more scrutiny over than Trump even though theyre only a few years apart. Biden is 81, Trump is 78.