Additionally, Customs and Border Protection, whose 20,000-plus Border Patrol agents are responsible for arresting illegal border crossers, will be out of money by mid-September at the “current burn rate,” Johnson told the Senate Appropriations Committee on Thursday as he defended the president’s emergency budget request.

Johnson said if Immigration and Customs Enforcement and the Border Patrol run out of money, the Homeland Security Department “would need to divert significant funds from other critical programs just to maintain operations.”