The U.S. Border Patrol’s second-in-command admitted to Congress on Tuesday that the U.S.-Canada border is not secure, an acknowledgment that comes days after Homeland Security Secretary Markwayne Mullin disclosed that Iranian nationals were encountered attempting to enter illegally over the northern border.

Border Patrol’s acting deputy chief, Jason Schneider, told House Homeland Security Committee members in a hearing Tuesday afternoon that the 21,000-person federal law enforcement organization did not have full awareness of what is coming over the 5,500 miles of shared boundary between the United States and Canada. However, Schneider insisted that it is spending congressional funding to increase the number of agents nationwide, as well as facilities and resources.