Montana became the first state in the U.S. to enact a complete ban on TikTok on Wednesday when Republican Gov. Greg Gianforte signed a measure that's more sweeping than any other state's attempts to curtail the social media app, which is owned by a Chinese tech company. The measure, scheduled to take effect on Jan. 1, 2024, is expected to be challenged legally and will serve as a testing ground for the TikTok-free America that many national lawmakers have envisioned. Cybersecurity experts say it could be difficult to enforce the ban. “Today, Montana takes the most decisive action of any state to protect Montanans’ private data and sensitive personal information from being harvested by the Chinese Communist Party,” Gianforte said in a statement. TikTok spokesperson Brooke Oberwetter argued that the law infringes on people’s First Amendment rights and is unlawful. She declined to say whether the company will file a lawsuit.