Famous comedian John Mulaney made a surprise appearance Nov. 5 as justices questioned President Donald Trump’s use of tariffs. Journalists Gabe Fleisher and NBC News were among those to report on Mulaney’s unexpected attendance in court.

Three lower courts have ruled illegal President Donald Trump's use of emergency powers to impose worldwide tariffs.

Trump has heaped pressure on the Supreme Court, which has a 6-3 conservative majority, to preserve tariffs that he has leveraged as a key economic and foreign policy tool.