Homeland Security Secretary John Kelly on Wednesday sought to manage expectations for a U.S.-Mexico border wall, while also softening on earlier indications that the administration might separate parents and children caught crossing the southwest border illegally.

Kelly, testifying before the Senate Committee on Homeland Security and Governmental Affairs, said “we’re not going to build a wall where it doesn’t make sense” — but assured that the administration will secure the border with a combination of fences, electronics, towers, and wall structures in areas determined by Customs and Border Protection agents.

“We’re not going to build a wall where it doesn’t make sense, but we’ll do something across the southwest border,” Kelly said.