US President Donald Trump hailed on Friday a call with Chinese counterpart Xi Jinping, claiming a deal to sell blockbuster app TikTok could be a "formality" and saying he would visit China, which gave a more cautious assessment of their talks.

The leaders of the world's two largest economies spoke by telephone for the second time since the return to the White House of Trump, who has tried to keep a lid on tensions despite his once virulent criticism of China.

The United States has forcefully sought to take TikTok, the social media platform hugely popular with young Americans that Trump has also used to garner support, out of Chinese hands.

Trump said that Xi "approved" the deal during the phone call, but later said: "We have to get it signed... I guess it could be a formality." China di

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