Video app TikTok is mobilizing its US users with a warning that the app could be banned in the country. “Congress is planning a total ban of TikTok,” said a notification from the popular video-sharing platform on Thursday. There was a button on the display to call the members of the US Congress from the users’ respective constituencies. The tech website The Information reported that one representative’s office was so inundated with calls that staff had no choice but to switch off the phones. TikTok’s warning was a reference to a bill that is currently being drafted in the US House of Represent…