How?
As you can see from Obama, any presidential executive order can be overturned without even a vote.
As I understand it, Trump can't do anything other than sign a bill from Congress. This would make it law. I would love to understand any other avenues. Please share if anybody see's another path please.
DEA/FDA are the main determiners about additions/deletions from the list
they answer to Trump
Congress actually does not usually mess with the list, though they have rarely done so by legislation