Jon Stewart Skewers Donald Trump While Hosting USO’s 75th Birthday Party

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Host Jon Stewart speaks during the 75th Anniversary USO Show at Joint Base Andrews on May 5 in Camp Springs, Md.

David Letterman, still sporting a full beard, also made a rare appearance at the event.

Jon Stewart could not help but take a few jabs at Donald Trump while hosting the United Service Organizations' 75th birthday party at the Joint Base Andrews in Maryland on Thursday.

The former Daily Show host, sporting a beard, was poking fun at Joe Biden before turning his sights to the GOP presidential frontrunner.

“He’ll say whatever he kind of thinks of, whatever comes to his mind, sort of impulsive," Stewart said of Biden. “Sometimes, you might think to yourself, ‘That sounds crazy,’ or ‘Man, that is crazy.’ And who would have thought that now, that gets you the Republican nomination.”

The joke got a lot of laughs, and Stewart couldn't help but keep going. 

“Don’t worry, Trump’s going to keep you busy," he told the military crowd. "You’re going to have to repaint all the planes with 'Trump' in big gold letters.”

David Letterman also made a rare appearance at the event . 

The former late night host, still sporting the full beard he's grown since leaving CBS' Late Show, joked he was just glad to be out of the house.