Millions of TikTok users in the United States are no longer able to watch videos on the social media platform as a federal ban on the immensely popular app takes effect.

The company’s app was removed Saturday evening from prominent app stores, including the ones operated by Apple and Google, while its website told users that the short-form video platform was no longer available.

The blackout began just hours before the law took effect. Apple said in a statement on its website that TikTok and ByteDance apps are no longer available in the U.S. and visitors to the country could have limited access.

President-elect Donald Trump said Saturday that he will "most likely" give TikTok a 90-day extension.  Trump told 'Meet the Press' moderator Kristen Welker in a phone interview that he's considering a 90-day reprieve, and would probably announce it on Monday when he takes office.