The Department of Homeland Security marked the official start of construction on President Trump’s promised border wall Monday at a groundbreaking ceremony less than 10 miles west of El Paso, Texas.

“The president has started his project,” El Paso Sector Chief Patrol Agent Aaron E. Hull told reporters during a press conference at the border in Santa Teresa, N.M. “This project is underway. This is the beginning, in this sector, of the president’s border wall.”