“We believe the facts and the law are clearly on our side, and we will ultimately prevail,” says a TikTok statement.
TikTok has promised a court battle over a new law that threatens to ban it in the US – with the app’s boss saying “we aren’t going anywhere”.
President Joe Biden approved the law that states the platform will be blocked if its Chinese owner, ByteDance, does not sell it within nine months.
US politicians are worried the company could share user data with the Chinese government, despite repeated assurances from TikTok that it would not.
The bill was approved by the Senate on Tuesday as part of a $95bn (£76.2bn) aid package for Ukraine and Israel.
Mr Biden signed it off early on Wednesday – with TikTok’s boss swiftly hitting back in a video on the platform.
“Rest assured, we aren’t going anywhere. The facts and the Constitution are on our side and we expect to prevail again,” said chief executive Shou Zi Chew.
A statement by the company added: “This unconstitutional law is a TikTok ban, and we will challenge it in court.
“We believe the facts and the law are clearly on our side, and we will ultimately prevail.”
The legal challenge could argue a ban would deprive the app’s 170 million US users of their First Amendment rights to freedom of speech.
The law could also face opposition from TikTok creators who rely on it for their income, while China has previously said it would oppose a forced sale.