The law gives the president the option to extend the ban by 90 days, but triggering the extension requires evidence that parties working on purchasing have made significant progress, including binding legal agreements for such a deal — and TikTok’s parent company, ByteDance, hasn’t publicly updated its stance that the app is not for sale.

Looming over the Supreme Court's TikTok decision is what could happen after Donald Trump takes office. Trump promised to "save" the popular platform.