TikTok went offline in the United States Saturday night, less than two hours before a ban was slated to go into effect. The extraordinary blackout prevents access to one of the world’s most popular social media apps – one that had been used by 170 million Americans. Visitors to the app were met with a message reading: “Sorry, TikTok isn’t available right now. A law banning TikTok has been enacted in the U.S. Unfortunately, that means you can’t use TikTok for now.” TikTok’s action comes after the Supreme Court on Friday upheld a ban that was passed with broad bipartisan support in Congress and signed into law in April by President Joe Biden. The law prevents American companies from hosting or serving content for the Chinese-owned social media platform unless it sells itself to a buyer from the United States or one of its allies. But TikTok may not be gone for long. The company suggested it could be back soon – perhaps as early as Monday. “We are fortunate that President Trump has indicated that he will work with us on a solution to reinstate TikTok once he takes office,” the company posted in its pop-up message to users who opened the app beginning late Saturday night. “Please stay tuned!” President-elect Trump said he will “most likely” delay a ban on TikTok for 90 days after he takes office on Monday, adding that he has not made a final decision in a phone interview with NBC News on Saturday. “I think that would be, certainly, an option that we look at. The 90-day extension is something that will be most likely done, because it’s appropriate. You know, it’s appropriate. We have to look at it carefully. It’s a very big situation,” Trump said in the interview. “If I decide to do that, I’ll probably announce it on Monday,” he added.