TikTok plans to shut U.S. operationsof its social media app on Sunday when a federal ban is set to take effect, barring a last-minute reprieve, people familiar with the matter said. The app is used by 170 million Americans.

The popular social media app TikTok will likely go dark for its 170 million American users this Sunday, Jan. 19, after months of fighting the federal government’s demand that it separate from its China-based parent company,

With the TikTok ban set to hit the US on Sunday, two Presidents and one Congressman are working to extend the deadline.

The law could go into effect on Sunday, so here's what could happen. The US Supreme Court heard arguments Friday about whether or not to uphold a law that effectively bans the social media app TikTok.