Alex Wong/Getty ImagesAPRIL 28, 2017 WASHINGTON— “The North Korean top leadership has to go.” With that bold assertion, Gov. John Kasich (R) of Ohio raised a controversial argument for American action aimed at neutralizing the North Korean nuclear threat. “An ability to remove a number of the top people, and have a more benign leadership there that understands what’s at risk, I think is perhaps doable,” Governor Kasich told reporters Friday at a breakfast hosted by The Christian Science Monitor. Kasich – the final competitor against Donald Trump for the Republican presidential nomination in 2016 – has not fully closed the door to running again in 2020, one more reason that his views on policy command an audience.