Maybe this would be a better starting point for this discussion. What can we reasonably expect from a president who has no support from his colleagues?
Ending the wars (including the drug war).
Restoring the rule of law where no part of the executive goes against the law but complies with all laws.
Starting criminial procedings for the war crimes that various US politicians and official committed in the last decade.
Especially the last point will shake up the political system of the US.