There is big chasm between banning an app from fleet devices and banning both an app and a website in an entire country. Especially one that is so enormously popular.
I cannot recall the last time I've seen such a bipartisan push for something so monumental. Just within the past week, Senators Josh Hawley (R-MO) and Mark Warner (D-VA) have been saying virtually the same thing: TikTok is an unprecedented national security threat.