President Donald Trump and Chinese President Xi Jinping will seek an agreement to help keep the video app TikTok online in the US and ease tensions between two superpowers locked in a stand-off over trade.

The agreement is at the top of the agenda alongside trade for the leaders' first known call in three months, expected on Friday morning, Washington time, US officials said.

China has not confirmed plans for the call.

Trump and Xi's effort to steady relations comes as the two governments have been discussing a potential in-person summit between Xi and Trump during the Asia-Pacific Economic Co-operation summit in South Korea on October 30-November 1, Reuters has reported.

Beijing's sign-off is one of the hurdles Trump needed to clear to keep TikTok open.

Congress had ordered the app s

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