Columbia subject headings:
Border security--United States.
Deportation--United States.
Detention of persons--United States.
Illegal aliens--Government policy--United States.
National security--United States.
Harvard subject headings:
Border security--United States
Deportation--United States
Detention of persons--United States
Illegal immigration--Government policy--United States.
National security--United States
Noncitizens--Government policy--United States
Princeton subject headings:
Border security--United States.
Deportation--United States.
Detention of persons--United States.
Illegal aliens--Government policy--United States.
National security--United States.