TikTok stopped working in the United States late on Saturday and disappeared from Apple and Google app stores ahead of a law that takes effect Sunday requiring the shutdown of the app used by 170 million Americans.

President-elect Donald Trump said earlier in the day he would “most likely” give TikTok a 90-day reprieve from the ban after he takes office on Monday, a promise TikTok cited in a notice posted to users on the app.

TikTok, which is owned by China’s ByteDance, told users attempting to use the app around 10:45 p.m. ET (0345 GMT): “A law banning TikTok has been enacted in the US Unfortunately, that means you can’t use TikTok for now. We are fortunate that President Trump has indicated that he will work with us on a solution to reinstate TikTok once he takes office. Please stay tuned.”

Other apps owned by ByteDance, including video editing app Capcut and lifestyle social app Lemon8, were also offline and unavailable in US app stores as of late Saturday.

“The 90-day extension is something that will be most likely done, because it’s appropriate,” Trump told NBC. “If I decide to do that, I’ll probably announce it on Monday.”

TikTok users logging on late on Saturday were met with a message that said the law would “force us to make our services temporarily unavailable. We’re working to restore our service in the US as soon as possible.”

It was not clear if any US users could still access the app, but it was no longer working for many users and people seeking to access it through a web application were met with the same message that TikTok was no longer working.

The Chinese-owned app, which has captivated nearly half of all Americans, powered small businesses and shaped online culture, said on Friday it will go dark in the US on Sunday unless President Joe Biden’s administration provides assurances to companies such as Apple and Google that they will not face enforcement actions when a ban takes effect.

Under a law passed last year and upheld on Friday by a unanimous Supreme Court, the platform has until Sunday to cut ties with its China-based parent ByteDance or shut down its US operation to resolve concerns it poses a threat to national security.

The White House reiterated on Saturday that it was up to the incoming administration to take action, increasing the likelihood of a shutdown on Sunday.

“We see no reason for TikTok or other companies to take actions in the next few days before the Trump administration takes office on Monday,” press secretary Karine Jean-Pierre said in a statement.

TikTok did not respond to a request for comment on the new White House statement.

The Chinese embassy in Washington on Friday accused the US of using unfair state power to suppress TikTok. “China will take all necessary measures to resolutely safeguard its legitimate rights and interests,” a spokesperson said.