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

In the spring, President Joe Biden signed the Protecting Americans from Foreign Adversary Controlled Applications Act, giving TikTok nine months to divest from its Chinese parent company, ByteDance, or be erased from U.S.-based app stores. That deadline is January 19.

After nearly three hours of Supreme Court arguments Friday morning, Americans are one step closer to learning whether a TikTok ban will take effect in nine days.