Gov. Greg Gianforte signed a bill banning TikTok in Montana, making it the first state to ban the app in the U.S.

The Republican governor signed legislation into law Wednesday, saying the ban is aimed at protecting citizens from foreign influence since TikTok is owned by Beijing-based ByteDance.

“To protect Montanans’ personal and private data from the Chinese Communist Party, I have banned TikTok in Montana,” Gianforte tweeted.

It follows efforts in Congress, including a bipartisan bill in the Senate targeting TikTok and other apps from foreign adversaries. But momentum has stalled in recent weeks after libertarian members like Rand Paul (R-Ky.) and progressive Democrats like Rep. Alexandria Ocasio-Cortez (D-N.Y.) came out against a ban.

TikTok says the law violates the First Amendment, as the company continues to assess its next legal steps. “We want to reassure Montanans that they can continue using TikTok to express themselves, earn a living, and find community as we continue working to defend the rights of our users inside and outside of Montana,” Brooke Oberwetter, a TikTok spokesperson, said in a statement.