Jon Stewart says Biden looked like he had ‘resting 25th Amendment face’ — that establishes processes in case of a president’s death — at the debate

• President Joe Biden had a rough night at his first presidential debate of the year.
• Biden's performance on Thursday was riddled with gaffes and stumbles.
• Turns out "The Daily Show" host Jon Stewart thinks the debate was a disaster for Biden too. 

Jon Stewart has weighed in on Thursday's presidential debate and he thinks it was a disaster for President Joe Biden, 81, too.

"The Daily Show" host went live following the debate, where he poked fun at Biden's performance against his rival, former President Donald Trump, 78.

At one point in the debate, Biden misspoke while defending his accomplishments in healthcare policy, saying that his administration had "finally beat Medicare."

Trump quickly jumped on Biden's misstep: "Well, he's right. He did beat Medicare. He beat it to death, and he's destroying Medicare."

"Okay, a high-pressure situation. A lot of times, you can confuse saving Medicare with beating it," Stewart joked.

"I'm sure it's not something that repeated throughout the debate, causing Democrats across the country to either jump out of windows or vomit silently into the nearest recycling bin," he continued.

But Biden, Stewart said, also seemed to run into trouble during the debate even when it wasn't his turn to speak. Biden was seen grimacing, looking stunned, and with his mouth hanging open while Trump spoke — and Stewart highlighted that in a supercut he played on the show.

"A lot of people have resting 25th Amendment face," Stewart said, referencing the section in the constitution that establishes processes in case of a president's death.

"I'm not a political expert, but while Biden was preparing at Camp David for a week, did anyone mention he would also be on camera on a split screen?" he continued.

This isn't the first time Stewart has called attention to Biden and Trump's advanced ages.

When Stewart returned to "The Daily Show" in February, his first monologue touched on Biden's and Trump's fitness for the Oval Office.

"These two candidates. They are both similarly challenged," Stewart said. "And it is not crazy to think that the oldest people in the history of the country to ever run for president might have some of these challenges."

Last month, Stewart told audiences at the "Netflix is a Joke Fest" that Biden is so old that he "shouldn't be president."

"I know you know how fucking old he is, and I know you don't want to say it because Trump is so scary, but he's so fucking old," Stewart said. "I'm not saying that Biden can't contribute to society, he just shouldn't be president."

Representatives for Biden and Trump did not immediately respond to requests for comment from BI sent outside regular business hours.