The US House of Representatives has passed a landmark bill that could see TikTok banned in America.
It would give the social media giant's Chinese parent company, ByteDance, six months to sell its controlling stake or the app will be removed in the US.
While the bill passed overwhelmingly in a bipartisan vote, it still needs to clear the Senate and be signed by the president to become law.
Lawmakers have long held concerns about China's influence over TikTok.
ByteDance is based in Beijing and is subject to a national security law requiring it to share data with Chinese officials.
Mike Gallagher, a Wisconsin Republican who co-authored the bill, said the US could not "take the risk of having a dominant news platform in America controlled or owned by a company that is beholden to the Chinese Communist Party".
TikTok has tried to reassure regulators that it has taken steps to ensure the data of its 150 million users in the US has been walled off from ByteDance employees in China.
However, an investigation by the Wall Street Journal in January found the system was still "porous", with data being unofficially shared between TikTok in the US and ByteDance in China. High-profile cases, including one incident where ByteDance employees in China accessed a journalist's data to track down their sources, have stoked concerns.
After the vote on Wednesday, a spokesperson for the company accused lawmakers of jamming through a "ban" following what they called a "secret" process.