Why does US see Chinese-owned TikTok as a security threat?

U.S. lawmakers have grilled TikTok CEO Shou Zi Chew about data security and harmful content, with some pushing to ban the popular short-video app nationwide.

Chew, a native of Singapore, told the lawmakers that TikTok prioritizes user safety as he sought to avert a U.S. ban on the app by downplaying its ties to China.