Why is TikTok getting banned? What’s behind the law that could shutter the app

Washington — The 170 million TikTok users in the U.S. could be in for a rude awakening come Sunday if they suddenly find the enormously popular video-sharing app is inaccessible because of a law passed by a bipartisan majority in Congress last year.

Lawmakers and U.S. officials have sounded the alarm for years about the supposed risks that TikTok's ties to China pose to national security, and Congress moved last year . . .