Try draining a swamp. Not easy at all. D.C. was an actual swamp, and even after draining it, as you can see, the swamp has regained dominance once again. So after draining it's tough to keep it drained, because the refilling process never stops.
Now if President Trump were truly the dictator the left label him as being, that draining would be much easier. But he is not a dictator.