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

Donald Trump had asked the Supreme Court to delay TikTok’s ban-or-sale law to give him an opportunity to act once he returns to the White House.

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.”