NEW YORK (AP) — During his first term as president, Donald Trump led the effort to ban TikTok, the hugely popular video-sharing site he said posed a threat to U.S. national security. But on the eve of his return to the White House, the president-elect is being hailed as the app’s savior.

The president-elect Sunday pledged an executive order, hours into his second term, returning access for American users, at least temporarily.

Trump’s brief message lays out his intention to seek partial American ownership of TikTok, but it isn’t clear he has authority to suspend the law that shut it down this weekend.

TikTok said Sunday it was restoring service to users in the United States after the popular video-sharing platform went dark in response to a federal ban that President-elect Donald Trump said he would try to pause by executive order on his first day in office.

Even if temporary, the unprecedented shutdown of TikTok is set to have a wide-ranging impact on U.S.-China relations, U.S. politics, the social media marketplace and millions of Americans.

TikTok says it’s “in the process” of restoring service to users in the United States after the popular video-sharing platform went dark in response to a new law.

Trump has said he has a "warm spot" for the app, a distinct change of heart after his first administration first called for a ban on TikTok.

The app had more than 170 million monthly users in the U.S. The black-out is the result of a law forcing the service offline unless it sheds its ties to ByteDance, its China-based parent company.

The Supreme Court upheld a law that requires TikTok's Chinese owner to sell off the app's U.S. business or face a nationwide ban Sunday.