"I can't wait to see how history books cover 2019," one Twitter user joked, after testimony Thursday involved Jay Leno, A$AP Rocky and the Kardashians.
In both his opening statement and later testimony, European Union ambassador Gordon Sondland named the rapper as a topic of discussion on a call with Trump.
The rapper is scheduled to perform in Stockholm in December.
The rapper, whose case attracted the attention of President Trump, was given a suspended sentence and will not face prison time.
President Donald Trump commented on the rapper's release on Twitter.
Diplomat Robert O’Brien's appearance is another sign of the president's involvement in the rapper's case.
"Political interference in the process is distinctly off limits," Carl Bildt wrote. "Clear?”
The U.S. rapper, whose detention has prompted a major international response, will remain in custody until his trial, prosecutors said Thursday.
The president offered to "personally vouch" for the rapper's bail during a phone call with Sweden's prime minister.
"While you're at it, could you also let those kids in cages out?" the singer asked the president.