The U.S. Customs and Border Protection (CBP) identifies the chief issues along the border as domestic and international terrorism; drug smuggling and smuggling of products (such as tobacco) to evade customs duties; and illegal immigration.[32] A June 2019 U.S. Government Accountability Office report identified specific staffing and resource shortfalls faced by the CBP on the Northern border than adversely impact enforcement actions; the U.S. Border Patrol "identified an insufficient number of agents that limited patrol missions along the northern border" while CBP Air and Marine Operations "identified an insufficient number of agents along the northern border, which limited the number and frequency of air and maritime missions."[32]