“Look, I just think he’s uninformed,” Bush said. “The simple fact is that he’s been wrong on Syria and on the refugees pretty consistently. And no one’s holding him to account. He first said we had no interest in being involved in Syria. And then he said let the Russians take out ISIS. And then he said let ISIS take out [Syrian President Bashar] Assad. Back and forth it goes. And the net effect of this is in these really serious times he’s not a serious leader.”

Bush, who Trump has repeatedly assailed as being “low-energy,” did praise the Republican front-runner’s media strategy, saying he’s played reporters “like a fiddle…by saying outrageous things and garnering attention.”

The former Florida governor also called Trump “smart” and reiterated his pledge to support the eventual GOP presidential nominee. That said, Bush said he’s confident that Trump will eventually fade.