The move continues a remarkable turnabout toward the app for President Trump, who tried to ban TikTok in his first term.

The White House launched a TikTok account on Tuesday amid uncertainty about the app’s future, as another deadline approaches for its parent company, Bytedance, to sell to a US buyer or be banned in the United States.

A new official account for the White House is on the social media platform TikTok. The administration has been delaying a shutdown of the service as it seeks to work up a deal for American ownership. The White House has officially joined TikTok, even as the administration is trying to help determine the future of the platform in the US.