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              Congressional                                               ______
            *.Research Service






Can the President Close the Border? Relevant

Laws and Considerations



April   12, 2019

Does the executive branch have authority to close the southern border? Recently, President Trump
declared that he would order the closure of the U.S.-Mexico border or at least large sections of it, unless
Mexico acts to stop flows of migrants and drugs into the United States or unless Congress enacts certain
reforms to the immigration system. The statements presumably refer to the closure of land ports of entry
on the border (federal laws already prohibit entry between ports, and a Trump Administration policy that
would have rendered non-U.S. nationals (aliens) who violate those laws ineligible for asylum protections
has been blocked by federal courts, as explained in a separate Legal Sidebar). The President later declared
that he would give Mexico a one-year warning before placing tariffs on cars made in Mexico or closing
the border. His statements have prompted legal questions about the reach of executive authority to close
ports of entry on the southern border to people and goods.
Little federal case law addresses these questions. Although recent media articles discuss at least four
occasions when past presidents have restricted operations at ports of entry on the southern border, those
executive measures apparently did not prompt legal challenges that required federal courts to assess the
Executive's authority for the measures. The measures taken on at least one of the occasions covered in the
articles-the aftermath of President Kennedy's assassination in 1963-may have constituted a full closure
of ports of entry on the southern border for much of the afternoon and evening of November 22, 1963. On
another occasion, President Reagan ordered the closure of nine ports of entry for a matter of days after
the abduction of a Drug Enforcement Administration (DEA) agent in Mexico in 1985. On two other
occasions-President Nixon's Operation Intercept in 1969 and President George W. Bush's post-9/11
measures-the  restrictions consisted primarily of extensive inspections that brought border traffic to a
standstill, according to the reports.
Federal statutes grant the Department of Homeland Security (DHS) general authority over operations to
secure the border and specific authority to close temporarily any ... port of entry when necessary to
protect national interests. Other statutes give the President broad authority to suspend the entry of non-
U.S. citizens. Together, these statutes probably authorize a range of targeted executive measures to close a
port of entry or to restict operations at some ports, at least in some circumstances. Whether the statutes
authorize more sweeping executive action to close many or all of the ports of entry on the southern border
to most or all people and goods, however, is a question with which federal courts have not grappled and

                                                                 Congressional Research Service
                                                                   https://crsreports.congress.gov
                                                                                      LSB10283

CRS Legal Sidebar
Prepared for Members and
Committees of Congress

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