Eight TikTok content creators sued the U.S. government on Tuesday, issuing another challenge to the new federal law that would ban the popular social media platform nationwide if its China-based parent company doesn’t sell its stakes within a year.

Attorneys for the creators argue in the lawsuit that the law violates users’ First Amendment rights to free speech, echoing arguments made by TikTok in a separate lawsuit filed by the company last week. The legal challenge could end up before the Supreme Court.

The complaint filed Tuesday comes from a diverse set of content creators, including a Texas-based rancher who has previously appeared in a TikTok commercial, a creator in Arizona who uses TikTok to show his daily life and spread awareness about LGBTQ issues, as well as a business owner who sells skincare products on TikTok Shop, the e-commerce arm of the platform.

The lawsuit says the creators “rely on TikTok to express themselves, learn, advocate for causes, share opinions, create communities, and even make a living.”

“They have found their voices, amassed significant audiences, made new friends, and encountered new and different ways of thinking — all because of TikTok’s novel way of hosting, curating, and disseminating speech,” it added, arguing the new law would deprive them and the rest of the country “of this distinctive means of expression and communication.”

A spokesperson for TikTok said the company was covering the legal costs for the lawsuit, which was filed in a Washington appeals court. It is being led by the same law firm that represented creators who challenged Montana’s statewide ban on the platform last year. In November, a judge blocked that law from going into effect.

The Department of Justice said that the legislation that could ban TikTok “addresses critical national security concerns in a manner that is consistent with the First Amendment and other constitutional limitations. We look forward to defending the legislation in court.”

The federal law comes at a time of intense strategic rivalry between the U.S. and China on a host of issues and as the two butt heads over sensitive geopolitical topics like China’s support for Russia in its invasion of Ukraine. U.S. lawmakers and administration officials have aired concerns about how well TikTok can protect users’ data from Chinese authorities and have argued its algorithm could be used to spread pro-China propaganda, which TikTok disputes.

Under the law, TikTok’s parent company ByteDance would be required to sell the platform to an approved buyer within nine months. If a sale is in progress, the company will get a three-month extension to complete the deal.