Jon Stewart: Trump can't control 'the projectile vomit of d*ckishness' coming out of his mouth
Jon Stewart discusses Donald Trump on 'The Daily Show' on July 20, 2015. [YouTube]

Jon Stewart returned to The Daily Show on Monday to scoff at Republicans who are suddenly willing to distance themselves from Donald Trump -- but only after he bad-mouthed one of their own in Arizona Sen. John McCain.

"The only reason you like this guy in the first place is because of the terrible things he was willing to say about Obama," he said. "But Trump has no control over the projectile vomit of dickishness that comes out of his mouth every time he opens it. It was inevitable some of his word puke was gonna get on you."

The GOP should have known better, Stewart said, because the party had been down the same road in 2008 with Sarah Palin and her "Wasilla word salad."

"Once you cast a spell and bring an Internet comment to life, it no longer belongs to you," he explained. "Only this time, the chatroom troll emoji you've conjured has $10 billion of its own money."

Stewart also shot down Trump's claim that he actually reversed course immediately after saying McCain was "not a war hero." In fact, the host pointed out, Trump said, "He's a war hero because he got captured."

He also laughed off Trump's complaning to NBC News that while "[his] hair is fine," nobody comes to his defense when people make fun of his hair.

"First things first: your hair's not fine," Stewart said. "I agree, making fun of someone's physical appearance is a cheap blow. But that hair? That is comedy entrapment. People are not attacking your hair -- they are defending themselves from something that appears like it's about to attack them."

Watch Stewart's commentary, as posted online on Monday, below.