Where is Justice Ruth Bader Ginsburg? Twitter goes nuts over her absence during Trump speech

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.

See Twitter reactions to Ginsburg's absence

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

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

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.