[20190211]IN11040_入境口岸之间的边境安全：第116届国会的国土安全问题.pdf

CRS INSIGHT Prepared for Members and Committees of Congress INSIGHTINSIGHTi i Border Security Between Ports of Entry: Homeland Security Issues in the 116th Congress Audrey Singer Specialist in Immigration Policy Updated February 11, 2019 The United States southern border with Mexico runs for approximately 2,000 miles over diverse terrain, varied population densities, and discontinuous sections of public, private, and tribal land ownership. The Department of Homeland Security (DHS) Customs and Border Protection (CBP) is primarily responsible for border security, including the construction and maintenance of tactical infrastructure, installation and monitoring of surveillance technology, and the deployment of border patrol agents to prevent unlawful entries of people and contraband into the United States (including unauthorized migrants, terrorists, firearms, narcotics, etc.). CBPs border management and control responsibilities also include facilitating legitimate travel and commerce. Existing statute pertaining to border security confers broad authority to DHS to construct barriers along the U.S. border to deter unlawful crossings, and more specifically directs DHS to deploy fencing