President Biden signed legislation that could ban TikTok into law in April, teeing up a countdown for the video-sharing app's sale.

TikTok is set to begin its fight against a possible ban in the United States. The social media company will have a crucial day in court on Monday, Sept. 16.

The U.S. government and TikTok will go head-to-head in federal court on Monday as oral arguments begin in a consequential legal case that will determine if – or how — a popular social media platform used by nearly half of all Americans will continue to operate in the country.