WASHINGTON (Reuters) -The Supreme Court upheld on Friday a law banning TikTok in the United States on national security grounds if its Chinese parent company ByteDance does not sell it, putting the popular short-video app on track to go dark in just two days.

President Joe Biden's administration said it will be up to President-elect Donald Trump to implement the ban on TikTok, which is set to take effect in two days after the Supreme Court upheld the law Friday.

U.S. Supreme Court has upheld the TikTok ban, leaving the app's future uncertain. With Joe Biden set to demit office soon, questions arise regarding whether he will enforce this decision as one of his final acts.

In TikTok's case it could give Congress time to consider a new bill that would give ByteDance another 270 days to find an American buyer before being shut down.

A ban on the popular app is set to start Sunday, although the Supreme Court could rule anytime on whether to uphold it.

President Joe Biden won’t enforce a ban on the social media app TikTok that is set to take effect a day before he leaves office, a U.S. official says.

The Supreme Court upheld a law banning TikTok in the US over national security concerns unless its Chinese parent ByteDance sells it. Without immediate assurances from the Biden administration, the app will go dark on January 19.

Congress last year in a law signed by President Joe Biden required that TikTok’s China-based parent company ByteDance divest the company by Jan. 19 or risk getting banned in the U.S.

The White House has looked into options to keep TikTok accessible to its 170 million American users if a ban that is set to go into effect Sunday continues as planned.

A growing number of lawmakers are urging President Joe Biden to grant a reprieve to prevent TikTok from going dark in the United States as soon as Sunday, warning millions of creators and businesses could be hurt.

TikTok said it will have to “go dark” this weekend unless the outgoing Biden administration assures the company it won’t enforce a shutdown of the popular app after the Supreme Court on Friday unanimously upheld the federal law banning the app unless it’s sold by its China-based parent company.