TikTok is suing the United States government to try and stop enforcement of a bill passed last month that seeks to force the app’s Chinese owner to sell the app or have it banned.

According to NBC, the lawsuit, which was filed earlier today May 7, in the U.S. Court of Appeals for the D.C. Circuit, argues that the bill, the Protecting Americans from Foreign Adversary Controlled Applications Act, violates constitutional protections of free speech.

The suit also calls the law an “unprecedented violation” of the First Amendment.

“For the first time in history, Congress has enacted a law that subjects a single, named speech platform to a permanent, nationwide ban,” TikTok wrote in the lawsuit, “and bars every American from participating in a unique online community with more than 1 billion people worldwide.”

The company argues that invoking national security concerns is not a sufficient reason for restricting free speech and that the burden is on the federal government to prove that this restriction is warranted. It has not met that burden, the lawsuit further stated.

The lawsuit states that Congress has not offered any evidence suggesting that TikTok poses the types of data security risks or foreign propaganda spread that “could conceivably justify” the law, and has failed to prove that the app poses any specific harm in these areas.

TikTok’s Chinese owner, already had more than a year to make a move. Now, legal proceedings will pause that timeline, meaning it could be years before a ban goes into effect.