Former Mexican President Vicente Fox says he “doesn’t mind” if the U.S. builds a physical wall along the U.S.-Mexico border but reiterated his fierce opposition to the suggestion that the U.S. bill Mexico for its construction.

“No, I don’t mind. If you’re going to build a wall and spend $30 billion, do it,” Fox told SiriusXM radio host Pete Dominick. “We mind about paying for the wall. We mind about the United States isolating itself in four walls. You’re losing world leadership.”