#XSuperApp President Donald Trump has for a third time extended the deadline that would have required TikTok to be sold or face a ban in the US.

A bipartisan law passed by Congress last year mandates TikTok's Chinese parent company, ByteDance, sell the app.

The platform 'went dark' for a day in January after the law took effect, until Trump intervened issuing consecutive 75-day postponements, and now a 90 day extension until September.

The US government has said TikTok poses a threat to national security because Chinese authorities might access its vast trove of user data, which Beijing denies.

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Trump once supported a ban, but changed his position in part because of the role he believes it played in his second election victory: "I have a warm spot in my heart for TikTok because I won youth by 34 points", he said in December.