While Donald Trump was delivering his first speech as president to a joint congress on Tuesday night, one nagging question was obsessing Twitter. And for once, it wasn't about Trump - at least not entirely.

Social media was agonizing over the very visible absence of U.S. Supreme Court Justice Ruth Bader Ginsburg.

Justices Anthony Kennedy, Stephen Breyer, Sonia Sotomayor and Elena Kagan all attended the address, court spokeswoman Kathy Arberg confirmed. Conservative Justices Samuel Alito and Clarence Thomas did not attend, but that has been their tradition in recent years.

But Justice Ginsburg had attended all eight of former President Obama's speeches, and Twitter quickly erupted with questions concerning her whereabouts.

Wait. WHERE IS RBG?!? DID I JUST MISS HER?! Who's turn was it to check on her and bring her Vitamin smoothies to her?!?! #JointAddress — Natasha (@Toooshie) March 1, 2017

See Twitter reactions to Ginsburg's absence



18 PHOTOS RGB skips Trump's Congressional address See Gallery RGB skips Trump's Congressional address RBG and my dem ladies #resist #persist RBG not in the house. #JointAddress #hu12117 I didn't see the Notorius RBG....did she come in? WHERE IS RBG??????? Where is RBG?! Omg this is not drill. #Jointsession Wake me up when Notorious RBG screams out “You Lie!” @fordm RBG skipped the Bush years as well, if memory serves Come on, Notorious RBG, hang in there. We need you to live at least another four years. #JointAddress RBG is always throwing shade -- she's skipping Trump's first address to Congress. https://t.co/x2cLUa6yno Which is a crushing blow because watching another Justice try to nudge RBG awake as she head bobs is one of the gre… https://t.co/X9ssn3RwHf Also, RBG is safely at home in her bed, with normal respiration and blood pressure, we all hope. Oh good. Getting close to the speech now. I need a new Notorious RBG snooze still shot for my collection. Ruth Bader Ginsburg is not attending tonight, and this is said to be unusual. #TrumpSpeech #RBG #SCOTUS Hoping that Notorious RBG doesn't snooze through this one. We need you! Notorious RBG boycotting the #JointSession like a boss. Looks like #RBG isn't in the room, sitting with the "Supremes" tonight to hear Trump's speech. @kscincotta I saw RBG isn't there... hoping it's her :) Notorious RBG will be sitting out the Obscene Tangerine’s address tonight. That’s good enough for me. Nite, nite, Twitter. #sotu #stfu Up Next See Gallery Discover More Like This HIDE CAPTION SHOW CAPTION of SEE ALL BACK TO SLIDE

Some users speculated that Ginsburg was "too busy" to make the speech.

The Notorious RBG has other plans for the evening. pic.twitter.com/FWV8xXXAQ3 — MaskOn😷Mimsy💛 (@MimsyYamaguchi) March 1, 2017

SEE ALSO: Trump official rips Democrats skipping ceremony: 'Put your big boy pants on'

One user even went as far as to joke that Ginsburg was spending her evening with Obama.

I hope Notorious RBG is somewhere with President Obama having a glass of wine. — Gregory Parks JD/PhD (@BlackJDPhD) March 1, 2017

Ginsburg has been a critic of the president's, referring to Trump as a "faker" in the 2016 president election, saying that the then-candidate lacked "consistency."

"[Trump] says whatever comes into his head at the moment," Ginsburg said shortly before the Republican National Convention. "He really has an ego."

Trump responded calling for Ginsburg's resignation on Twitter days later and insulted her intellect.

"Justice Ginsburg of the U.S. Supreme Court has embarrassed all by making very dumb political statements about me," he tweeted. "Her mind is shot – resign!"

While Ginsburg did attend all of President Barack Obama's similar speeches to Congress, including his State of the Union addresses, she occasionally dozed off and even admitted she was not entirely sober.

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