[mjs33]

Does he have the authority to do this?

[grecy]

This [1] article mentions that Trump signed executive order 13873 [2] in May 2019 which could be used to force Apple and Google to remove it from their app stores.

[1] https://foreignpolicy.com/2020/07/24/trump-cant-ban-tiktok-f...

[2] https://www.whitehouse.gov/presidential-actions/executive-or...