Robert De Niro as Robert Mueller and Alex Moffat as...

Robert De Niro as Robert Mueller and Alex Moffat as Eric Trump on "Saturday Night Live." Credit: NBC / Will Heath

In the next-to-last original "Saturday Night Live" of the year, Robert De Niro reprised his Robert Mueller impression while guest host Jason Momoa went shoeless for his opening monologue -- possibly an "SNL" first, but he is the new Aquaman after all, so shoes are optional. 

Quickly the highlights: In the cold open, Donald Trump Jr. (Mikey Day) was tucking Eric Trump (Alex Moffat) into bed, while reading "The Night Before Christmas," when who should appear. De Niro's Mueller, with an I've-got-eyes-on-you gesture, then emerged from the closet. 

"People say you're the worst thing that ever happened to my dad," said "Eric." 

Countered "Mueller": "No, getting elected president was the worst thing that ever happened to your dad." 

Momoa -- most famously Khal Drogo of "Game of Thrones" (and yes, there was a skit in commemoration) -- then performed what may be another monologue first: A cover, with castmembers Leslie Jones, Chris Redd and Kenan Thompson, of the George Clinton and Parliament Funkadelic hit, "Aqua Boogie." From PF's 1978 album, "Motor Booty Affair," the song's chorus includes the lines: "I can't swim/I never could swim/I never will swim ..."

Just as a reminder, if needed: Momoa is the new Aquaman. 

Meanwhile, "Weekend Update" offered outgoing Donald Trump chief of staff John Kelly a few memorable lines. Per co-anchor Colin Jost, he's leaving the job for surgery to remove his palm from his face -- and cut to a shot of an exasperated Kelly with his palm planted on his face. 

Jost: "That's how awful it is to work in the Trump White House. John Kelly spent 40 years in the Marines, he did three tours in Iraq, and he couldn't finish one tour with Donald Trump."

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