TikTok has asked a US federal court to overturn the new law banning the app, arguing it convenes the country's constitution on several grounds.
"For the first time in history, Congress has enacted a law that subjects a single, named speech platform to a permanent, nationwide ban," Tiktok and Chinese-based owner ByteDance said in the lawsuit.
Sparked into action by concerns around Beijing's potential access to US citizens' data and privacy breaches, US lawmakers last month passed legislation ruling TikTok must be sold to new owners or face a ban in the country.
The law, supported by US President Joe Biden, aims to force the divestiture by January 19, 2025.
But the lawsuit said divesting TikTok "is simply not possible: not commercially, not technologically, not legally" and will simply force a shutdown of TikTok "silencing the 170 million Americans who use the platform to communicate in ways that cannot be replicated elsewhere."