Well, he drained the swamp, now he's doing what he does best, paving it over and building a soon-to-be-failed casino.

Say what you will about "the swamp" (not a big fan myself), but as a metaphor it kinda works since a swamp may be noxious and filled with unsavory swamp creatures... but it's still an ecosystem where competition and co-evolution amongst these swamp species in response to external environmental changes would still be expected.