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               Congressional
           R a    esearch Service






Barriers Along the U.S. Border: Key

Authorities and Recent Developments



October 23, 2023

On October 5, 2023, Secretary of Homeland Security Alejandro Mayorkas invoked Section 102(c) of the
Illegal Immigration Reform and Immigrant Responsibility Act of 1996 (IIRIRA), waiving requirements
under twenty-six federal statutes to expedite construction of twenty miles of barriers and related
infrastructure along the U.S.-Mexico border. Secretary Mayorkas said that the waiver did not signal a
new Administration policy with respect to border walls. From day one, the Secretary continued, that
policy had been that a border wall is not the answer.
Secretary Mayorkas's waiver determination is the latest development in border barrier construction. The
Trump  Administration identified more than $16 billion to construct barriers from amounts originally
available to the Departments of Defense (DOD), Treasury, and Homeland Security (DHS). It also issued
several Section 102(c) waivers to facilitate construction. The Biden Administration, by contrast, largely
ceased barrier construction, canceling certain construction contracts while generally suspending others.
Different Congresses have also placed more or less emphasis on barrier construction. Over the years,
Congress specified barrier miles that the Secretary of Homeland Security (the Secretary) had to construct,
and lawmakers have repeatedly modified the Secretary's discretion over the location and characteristics of
those barriers. Congress has also varied how it makes appropriations for barrier construction, sometimes
expressly setting aside funds for fence or barrier system construction. This Sidebar examines the
Secretary's October 2023 waiver in light of the statutes that authorize and fund barrier construction.


Authorization to Construct Barriers

Before 1996, federal immigration statute did not expressly authorize, much less expressly require,
construction of barriers to deter unlawful migration. Still, the federal government had erected barriers for
this purpose, apparently relying on the Attorney General's general statutory responsibility to guard the
boundaries and borders of the United States against the illegal entry of aliens. (In 2003, Congress vested
this responsibility in the Secretary.) In 1996, Congress passed IIRIRA. Section 102 of the statute
(classified to the U.S. Code as a note to 8 U.S.C. @ 1103) expressly instructs immigration authorities to
construct barriers along the international land borders to deter unauthorized migration. Congress last
amended  Section 102 in 2007. The statute now expressly authorizes border barrier construction; imposes

                                                                  Congressional Research Service
                                                                    https://crsreports.congress.gov
                                                                                       LSB11059

CRS Legal Sidebar
Prepared for Members and
Committees of Congress

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