Stephen Colbert is airing live episodes of CBS' "The Late Show" after each night of the Republican National Convention this week and he will need  a little help. Luckily, on Monday he got an assist from an old friend. 

Colbert tapped former "Daily Show" host Jon Stewart, Colbert's former boss, for a segment to help explain the rise of presumptive GOP presidential nominee Donald Trump. The segment was one of the first pieces of political satire Stewart has done since stepping down as host of "The Daily Show" in 2015 and it is the first of multiple planned appearances on "The Late Show" this week. 

In the segment, a desperate Colbert visits a retired Stewart in a cabin where his "off the grid" life consists mostly of "chai kombucha" and "kale jerky." Colbert urges Stewart to join him in covering the Republican convention, but Stewart insists that he has done that before in 2012 and would be bored watching former Florida Gov. Jeb Bush get the nomination. However, Colbert breaks the news to the supposedly out-of-the-loop Stewart that Trump, not Bush, will be the nominee, leading to an elaborately staged spit take between the two comedians with Stewart's kombucha. The pair then trade Trump insults in disbelief that the businessman has a shot at the presidency. 

Eventually, Stewart agrees to help out Colbert. Later in the show, the host hinted that Stewart would return to the show later this week. 

"It was really great to see Jon Stewart again," Colbert told his audience. "You know what would be nice? To have that happen again some time this week."

In reality, of course, Stewart knows full well that Trump will be the GOP's nominee. During an interview with David Axelrod in May, Stewart said that "[Trump] is a man-baby...He has the physical countenance of a man and a baby's temperament and hands."

Despite his apparent displeasure for the nominee, though, Stewart is not interested in moderating one of the upcoming presidential debates between Trump and presumptive Democratic nominee Hillary Clinton. He recently responded to a petition that received more than 300,000 signatures in support of such a debate saying that he was too busy.