US President-elect Donald Trump will find a way to save TikTok before a ban on the app is due to take effect this weekend, his incoming national security adviser has said.

Congressman Mike Waltz, a Florida Republican, said Trump would intervene if the Supreme Court upholds a law that bans the platform in the US unless it is sold by 19 January.

In its last week, the Biden administration is also looking for ways to prevent TikTok from suddenly disappearing, reports NBC News.

Chinese owner ByteDance has said it plans to shut off the app for its 170 million US users by Sunday.

"We will put measures in place to keep TikTok from going dark," said Waltz on Thursday.

He noted that the law allows a 90-day extension for ByteDance if significant progress has been made towards a sale.

"Essentially that buys President Trump time to keep TikTok going," said Waltz.

• What happens if TikTok is banned?

A day earlier the incoming national security adviser hinted on Fox News that Trump was planning an executive order in an effort to suspend the ban.

However, it is unclear whether any such measure could circumvent a law passed by Congress.

The app has been banned on national security grounds, because of concerns that its data could be collected by the Chinese Communist Party.

But according to the New York Times, Trump has invited the chief executive of TikTok, Shou Zi Chew, to attend his presidential inauguration next Monday, sitting in a position of honour on the dais.