Users in the U.S. who opened the app were greeted with a message that read, "Sorry, TikTok isn't available right now."

TikTok went dark for users across the U.S. late Saturday as the app notified users of a ban that went into effect just days before President-elect Trump's inauguration.

The White House said on Friday that Tiktok should remain available to Americans but the timing of the Supreme Court ruling on a law banning the app means it must fall to the Trump administration.

A law that prohibits mobile app stores and internet hosting services from distributing the video-sharing platform to U.S. users takes effect on Sunday.

A lawyer for TikTok content creators on Friday urged the White House and the Justice Department to clarify to Apple and Google that they can continue to offer the TikTok short-video app in app stores on Sunday when a legal ban is set to take effect.

TikTok says service providers need "clarity" to ensure the app remains available when the ban takes effect on Sunday.

White House Press Secretary Karine Jean-Pierre called TikTok’s threat to “go dark” on Sunday, January 19th, a “stunt,” and that there is no reason for TikTok to shut itself down before President-elect Donald Trump is sworn in on the 20th.

Trump spoke to NBC News' Kristen Welker in an exclusive phone interview Saturday, discussing his plans on what to do about the popular social media app.

The White House on Saturday called TikTok’s statement warning that it will “go dark” on Sunday unless President Biden steps in a “stunt,” arguing the app doesn’t have to take action before President-elect Trump is sworn in.

Trump suggests he will extend the ban deadline by 90 days as Biden’s administration signals it won’t try to stop TikTok’s threatened shutdown on Sunday.

TikTok's app was removed from prominent app stores on Saturday just before a federal law that would have banned the popular social media platform was scheduled to go into effect.