President Donald Trump stopped in Otay Mesa during his trip to California to inspect eight prototypes of the potential border wall. His feedback? “You have to have see-through,” Trump told reporters, according to CBS Los Angeles. “You have to know what’s on the other side of the wall. You could be two feet away from a criminal cartel and you don’t even know they’re there.”

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Trump examined 30-foot border wall prototypes during his first trip to California since he won the election. The San Diego Union-Tribune reported he preferred a combination of a see-through wall topped with steel or rounded concrete to make it harder for climbers to scale. Archinect said there were solid, opaque options as well as four other materials, non-concrete prototypes Trump appeared to favor.

Related: Artists are turning the U.S.-Mexico border fence into the world’s longest peace-themed mural

The president said, “If you don’t have a wall system, we’re not going to have a country. There’s a lot of problems in Mexico, they have the cartels. We’re fighting the cartels, we’re fighting them hard.”

Trump also addressed criticism about the border wall from California’s governor, Jerry Brown, saying he thinks the governor “has done a very poor job running California” and “the place is totally out of control.”

“You have sanctuary cities where you have criminals living in the sanctuary cities,” he said.

Brown responded on Twitter, saying bridges are better than walls.

The San Diego Union-Tribune said hordes of both supporters and critics gathered throughout San Diego, and people were largely peaceful, but for shouting insults at the other side, and a Mexican flag was torn and almost burned. CBS Los Angeles said people peacefully protested Trump’s visit, chanting, “No ban! No wall!”

Via CBS Los Angeles, The San Diego Union-Tribune, and Archinect

Image via U.S. Customs and Border Protection on Flickr