As humiliated and soundly defeated as Jeb Bush was by Donald Trump, I'd like to think his brother George would hold him back from doing something so reckless. While he's no Donald Trump, George Bush was a great President in his own right. Also, I think Jeb has come to terms with his loss now that he sees what a great job Mr. Trump is doing for the country and for his party.
Trump is at the highest level of the government now so I'd like to think he'd be able to stomp out dissent. This will take time, so I can't totally rule the government out, but I'd say they're a less likely candidate.
Honestly, I don't think Kim Jong Un has the intelligence to pull something like this off. The smartest thing he did to gain power was not going to Disneyland.
http://theweek.com/articles/465775/k...-older-brother
That leaves the Clintons. I'm sure Hillary is still sour over her loss, and she has no problem remarking on it over and over. Blaming the Russians, racists, etc. Refusing to accept responsibility. Knowing her, she's probably planning a run in 2020, and plans to use this in a negative attack ad. Until she gets locked up she's never going to accept the fact that the American people simply don't want her in office (except Californians and they don't count as much as other states. Thank our God loving founders for that).