CALEXICO, Calif. — Homeland Security Secretary Kirstjen Nielsen on Friday unveiled the first completed border wall project that was constructed as a result of President Trump’s push to further secure the U.S.-Mexico border.

“Walls work, it’s not my opinion,” Nielsen said at the ceremony near downtown Calexico, a rural border town of approximately 38,000 residents. “It’s not a tag line. It’s a fact.”