Trump will never understand federalism. It is not the province of the federal government to legalize or make illegal any substance. There is no enumerated power allowing the government to regulate alcohol, drugs or any food for that matter. It is up to each state to determine what shall be permitted and under what restrictions. The state in turn may delegate that decision to the political subdivisions within the state. Personally, I oppose legalizing marijuana where I live. Now if someone in a neighboring county needs to burglarize my home to feed his drug habit, that person should also know that lead dispensers for self-defense are legal where I live.