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            Researh Service





Immigration Laws Regulating the Admission

and Exclusion of Aliens at the Border



Updated July 21, 2020
Before the Coronavirus Disease 2019 (COVID-19) pandemic, the past few years had seen a marked
increase in the number of apprehensions of non-U.S. nationals (aliens) at the border seeking to unlawfully
enter the country. But entry restrictions at the U.S.-Mexico border in response to the COVID-19 pandemic
have significantly reduced the number of alien apprehensions. Border closures and emergency measures
in other countries have also restricted the ability of some migrant caravans to reach the United States.
Even so, there continues to be considerable attention concerning the treatment of alien  without legal
immigration status who arrive at or near the U.S.-Mexico border.
This Legal Sidebar briefly examines the laws generally governing the admission and exclusion of aliens
at the border, including the procedures for asylum seekers and the circumstances in which arriving aliens
may be detained. The Sidebar also addresses special rules for the treatment of unaccompanied alien
children (UACs), recent policy changes affecting the processing of aliens at the border, and legislative
proposals that would alter the scope of protections for arriving aliens. Table 1 provides an overview of
the existing laws governing the detention and removal process for aliens.

General Statutory Framework Governing the Removal of Aliens
The Immigration and Nationality Act (INA) establishes a number of avenues by which aliens can be
denied entry or removed from the United States. Typically, when the Department of Homeland Security
(DHS) seeks to remove an alien found in the interior of the United States, it institutes removal
proceedings under INA §240. These formal proceedings are conducted by an immigration judge (IJ)
within the Department of Justice's Executive Office for Immigration Review. Aliens are afforded a
number of procedural protections in such proceedings. For example, the alien may be represented by
counsel at his or her own expense, potentially apply for relief from removal (such as asylum), present
testimony and evidence, and appeal an adverse decision to the Board of Immigration Appeals (BIA), the
highest administrative body responsible for interpreting and applying U.S. immigration laws.
Additionally, the alien may, as authorized by statute, seek judicial review of a final order of removal in
the judicial circuit in which the removal proceedings were completed. DHS may (but is not required to)
detain an alien during the pendency of formal removal proceedings, but may release the alien on bond or


                                                               Congressional Research Service
                                                                 https://crsreports.congress.gov
                                                                                   LSB10150

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