Worst debate answer. Trump: The biggest problem this world has today is not President Obama with global warming, which is inconceivable, this is what he's saying. The biggest problem we have is nuclear—nuclear proliferation and having some maniac, having some madman go out and get a nuclear weapon. That's in my opinion, that is the single biggest problem that our country faces right now. http://www.motherjones.com/kevin-drum/2015/12/here-worst-answer-tonights-debate