Former Mexican President Vicente Fox shot back at those in the Mexican government who believe they can work with Donald Trump if he becomes the next president of the United States, labeling him a “crazy guy.”

Fox told Vice News in an interview that President Enrique Pena Nieto made a mistake by saying he would be “absolutely respectful” of the next president, whether it’s Trump or former Secretary of State Hillary Clinton. He also went on to compare Trump to the likes of former Cuban dictator Fidel Castro and Venezuelan President Hugo Chavez.