Stuart Shapiro, a regulation law expert at Rutgers University, described the regulatory process constraints that any new president faces in an article for The Hill published back in December.
A new administration can avoid implementing any relatively new regulations. That means, for example, that the Trump administration might be able to avoid implementing the recently released draft ACA parameters for 2018.
But a new administration has to get Congress to pass legislation or go through the full rulemaking process to revoke or rewrite regulations and kill established regulations, Shapiro says.