Trump called Jong-Un a "maniac" during remarks about North Korea's nuclear program during a rally at Ottumwa, Iowa, but conceded, "You gotta give him credit."
"How many young guys -- he was like 26 or 25 when his father died -- take over these tough generals, and all of a sudden ... he goes in, he takes over, and he’s the boss," Trump said. "It's incredible. He wiped out the uncle, he wiped out this one, that one. I mean this guy doesn't play games. And we can't play games with him."
Last week North Korea announced it had successfully detonated a hydrogen bomb after an earthquake was detected near previous test sites, though the White House quickly disputed the claim. North Korea released an image of Jong-un personally authorizing the test.
The next morning Trump said that North Korea was under the "total control" of China.