Research ReportCRS Legal SidebarVersion 17
LSB10150
Immigration Laws Regulating the Admission and Exclusion of Aliens at the Border
Published Jul 21, 2020Updated Jun 20, 2025
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The Congressional Research Service is a nonpartisan policy and legal analysis arm of the Library of Congress. CRS reports are written for members of Congress and their staff, not the public — but they’re made available openly through Congress.gov.