"You want to ban TikTok? Great, you need a specific law from Congress that outlines under what circumstances companies may be banned in the US, and then prove the specific company meets those standards."

There is a specific law, the International Emergency Economic Powers Act, which specifies when and how a president can ban economic exchanges with foreign entities. I think you will be disappointed to find out that under this law there is no real due process required. The president only needs to declare a national emergency in regards to the ban and then send a report to Congress detailing why the declaration and ban are justified. If Congress disagrees it is justified they can pass a resolution overriding the ban.