michael buchanan - outlined how he will do it. thankl you. michael buchanan reporting. to be banned in the us — after a ruling by the supreme court. there've been concerns about the platform relating to issues of national security — because of the company's ties to china. live to san francisco and our technology correspondent lilyjamali. tell us more about why this has happened and what's the reaction been? time was running out. the supreme court of the united states was asked to weigh in on an expedited basis and that's exactly what they have done, deciding on a unanimous basis to uphold this law, which is now set to uphold this law, which is now set to take effect as planned on sunday. we should note there were only two options to tiktok, one was to sell to a us buyer, which they have repeatedly said they will not do. the other was to watch this ban take effect on january the 19th. now, the other was to watch this ban take effect onjanuary the 19th. now, it looks like that ban will go forward and affect 170 million american users of the app, some of whom have already