For the day it was banned, Tik Tok felt like a phantom limb. Even though the app was no longer available to use to watch videos, it was difficult to not click on it out of habit.

Mariska Nunn, 20, was said to have had her phone in her lap, watching a TikTok video, as she returned home from her boyfriend ...

Donald Trump is downplaying the potential threat that TikTok poses to national security -- but numerous aides and allies are squarely at odds with the president.