“The Daily Show” host Jon Stewart discussed ― at the start of the latest episode of his “Weekly Show” podcast ― the “freight train” that he believes Vice President Kamala Harris’ presidential campaign appears to have turned into, in a relatively short period of time.

“Holy shit!” Stewart said of likely Democratic nominee Harris’ packed rally this week in Atlanta, Georgia, where Megan Thee Stallion performed and Harris threw down the gauntlet for GOP nominee Donald Trump to debate her.

Stewart talked about how the buoyant atmosphere at Harris’ campaign stop may get seriously under Trump’s skin.

“It’s the one thing I think that would, more than any policy or any discrepancy on economics or anything else, the thing that would bother Donald Trump the most is a giant arena filled with enthusiastic supporters having a party,” he said.

“I almost think he’d be like, ‘What? Popularity is my thing,’” he added. Trump “doesn’t even give a shit about the election anymore, he just wants to be like, ‘My crowd was bigger.’”

Listen to the full episode here: