Nope. All you'll find are platitudes about states rights. No promises, nothing specific about rec.
In any case, the man commits a major lie every five minutes. There is no reason to spend any more time looking for your apocryphal speech. There is no reason to listen to him. Watch what he does. Stack the cabinet with swamp dwellers, scapegoat minorites, stomp on the free press, ramp up police forces, threaten recreational mj users. Judge our leaders by what they do, not what they say.
No wonder you want to live in the past, dwelling on what you imagine previous presidents did. Trump's administration is an abomination. No wonder you don't want to talk about it.