Trump has stated that he sides with states in this regard. Know your candidate. Although, who knows exactly what he really wants to do.
“In terms of marijuana and legalization, I think that should be a state issue, state-by-state. … Marijuana is such a big thing. I think medical should happen — right? Don’t we agree? I think so. And then I really believe we should leave it up to the states.” Washington Post, October 29, 2015
Seriously though, if you are gonna push a guy like you are you may want to read up on him.
Not even gonna quote the line about legalizing all drugs.