TikTok’s future in the United States now sits squarely in the hands of the Supreme Court, which will hear oral arguments Friday. At its core, the case features a head-on collision between national security and the First Amendment.

The U.S. Supreme Court will hear arguments on Friday challenging a law that seeks to ban TikTok in the U.S. on Jan. 19.

President-elect Donald Trump has urged the Supreme Court to halt the Jan. 19 TikTok ban if parent company ByteDance fails to sell the platform.

The last-minute Supreme Court review of the TikTok ban law is underway, and confidential documents are officially being transferred to the nation’s highest court. That documents transfer has arrived just days before the Supreme Court will hear a decidedly important oral argument in connection with the TikTok ban challenge.