WASHINGTON — President Donald Trump said on Tuesday that the U.S. and China have a deal that would keep the short-video app TikTok operating in the United States, transferring its U.S. assets to U.S. owners from China’s ByteDance, potentially resolving a saga that has lingered for nearly a year.

A deal on the popular social media app, which counts 170 million U.S. users, stands as a breakthrough in months-long talks between the world’s No. 1 and No. 2 economies that have sought to defuse a wide-ranging trade war that has unnerved global markets.

“We have a deal on TikTok … We have a group of very big companies that want to buy it,” Trump said on Tuesday, without giving details on the deal.

Any agreement could require approval by the Republican-controlled Congress, which passed a law in

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