Not exactly, and nothing that I can think of that would really fit in this circumstance. Had TikTok originated in the US and been bought by a foreign company,

Not exactly, and nothing that I can think of that would really fit in this circumstance. Had TikTok originated in the US and been bought by a foreign company, The Committee on Foreign Investment in the United States could have ordered the foreign company to divest itself of that asset. An example was Grindr being purchased by Kunlun Tech, and CFIUS deciding that this wasn't allowable. --The idea being that the type of data Grindr has could pose national security issues (due to government employees or elected officials being blackmailed, not that Grindr has ever been known for any form of security). With TikTok, however, it seems to be more about posturing. I'm not sure what legal mechanism they could really use to force the app to be blocked.