It seems as though former "The Daily Show" host Jon Stewart hitting up every possible late night show that he can.

It was just last week when Jon Stewart made a momentous return on "The Daily Show" to talk about the Zadroga Act - a cause that Jon Stewart has since been supporting.

However, for his second late night appearance, Jon Stewart decided to crash Stephen Colbert's monologue on "The Late Show," and ended up having to wear a Donald Trump wig.

"No one is going to listen to you unless you... I don't know how to put this - 'Trump' it up a little bit. The media won't pay attention to anything at all unless you're Donald Trump," Colbert told Stewart.

"If I'm elected - and I will be elected - I will build a wall around politics and I will make politics pay for it," said Jon Stewart, in an attempt to imitate the Republican presidential candidate for 2016.

Apparently, poking fun at Donald Trump was just a bonus for Jon Stewart. The former late night host appeared on the "The Late Show with Stephen Colbert" to further raise awareness on his cause. Mashable reports:

"Remember the Zadroga Act, which covers medical expenses for 9/11 first responders - and will run out of funding soon, unless Congress votes to reauthorize it? Jon Stewart does. And he won't stop appearing on late night shows until you do, too." 

Jon Stewart is actively raising awareness for the Zadroga Act before time runs out. As it turns out, Jon Stewart - who has been supporting the cause since 2010 - is using his fame for a good cause: he's currently working with activist groups to have the bill renewed and secure funds before Congress goes out of session.

Watch the Jon Stewart crash during Stephen Colbert's monologue for "The Late Show" in the video here.