Radio shock jock Howard Stern said Wednesday President Trump’s southern border wall was a 2016 campaign promise aimed at “morons.”

“The wall’s a problem because it’s a waste of money, even Donald knows that,” Stern said on his SiriusXM radio program. “You gotta know Donald a bit to understand what’s going on here. The wall’s a simplistic answer to our problems with immigration. It’s something that, you know, morons can get behind because they’re like, ‘Oh yeah, if you build a wall no one can get over it.’ But it’s not that simple.”