"It’s the best Biden optical illusion since he and Jill looked like giants next to the Carters," cracked "The Tonight Show" host.
"The Tonight Show" host suggested the real reason the former president has so far not returned to Twitter.
The actor spoke to Jimmy Fallon about teaming up with the children's franchise in October for a spoof of "The Avengers."
"Are you kidding me right now?" one asked the celebrity photobombers.
"Gobble gobble, gobble gobble," cracked the "Tonight Show" host in an imitation of the former president.
Stewart also detailed the origin of her nativity set during an interview with Jimmy Fallon on Thursday.
"The Tonight Show" host also found a "bright side" in Republicans winning control of the House.
"The Tonight Show" host joked that he was part of a death hoax on Twitter in the past so this time around wasn’t as traumatic for him.
"The Tonight Show" audience lapped up his one-liner about the Fox News personality.
"The Tonight Show" host also dinged Donald Trump Jr. and Eric Trump.