TikTok, whose parent is the Chinese company ByteDance, already faces a ban that would stop federal employees from using or downloading TikTok on government-owned devices.

"TikTok is China's backdoor into Americans' lives. It threatens our children's privacy as well as their mental health," he said on Twitter. "Now I will introduce legislation to ban it nationwide."

Hawley did not say when the bill would be introduced. Neither Hawley's office nor TikTok immediately responded to requests for comment.

Read more:

Kentucky bans TikTok from government-owned devices

Wisconsin, North Carolina ban TikTok from state devices on security concerns

(Reporting by Diane Bartz; Editing by Lisa Shumaker)