This is an open-ended question.
Forget Donald Trump; Trump will almost certainly be gone by 2020 and quite possibly by 2018. (In fact, any comments which mention him will be deleted unless they have a very good point to make about the effect of flooding on Houston. You have been warned.)
What I'm interested in chewing over is the effect of losing a major city—the fourth most populous metropolitan area in the United States—to a weather event that is already the worst in 800 years (with, potentially, worse to come) and flooding due to rainfall that will almost certainly exceed 100 centimetres in a week.
What happens next? Lessons in flood defenses and disaster mitigation? Changes to urban planning regimes? A major economic crisis (I'm guessing they just lost the Port of Houston, the busiest port in the USA in terms of foreign tonnage and second-busiest by overall tonnage, not to mention Houston's economy having a GDP on the order of $450Bn). Mass homelessness and destitution is a no-brainer: is this also going to destabilize the secondary insurance markets? What are the global consequences, outside the USA?
Tell me what happens next. Let's compare notes.