The app’s availability in the U.S. has been thrown into jeopardy over data privacy and national security concerns.

Without doubt, the remedy Congress and the President chose here is dramatic,” Justice Neil Gorsuch wrote in a concurring opinion. “Whether this law will succeed in achieving its ends, I do not know.”

The decision came a week after the justices heard a First Amendment challenge to a law aimed at the wildly popular short-form video platform used by 170 million Americans that the government fears could be influenced by China.