Immigration Arrests in the Interior of the United States: A Primer [Updated June 3, 2021] [open pdf - 693KB]
From the Document: "U.S. Immigration and Customs Enforcement [hyperlink] (ICE), a component of the Department of Homeland Security (DHS), is primarily responsible for immigration enforcement in the interior of the United States. ICE has substantial authority to arrest and detain non-U.S. nationals (aliens) identified for removal because of immigration violations. In recent years, there had been a marked increase [hyperlink] in arrests and removals conducted by ICE. As discussed in this Legal Sidebar [hyperlink] and as compared to prior administrations, the Trump Administration made enforcement a touchstone of its immigration policy, and ICE generally sought to enforce federal immigration laws against a broader range of aliens who had committed immigration violations. A recalibration of priorities by the Biden Administration has led ICE to prioritize immigration enforcement actions pertaining to a narrower category of aliens [hyperlink]; namely, those who present terrorism or national security concerns, those who recently came to or attempted to unlawfully enter the United States, or those who pose a threat to public safety based on the commission of certain crimes. While immigration enforcement priorities may change over time, the governing authorities for ICE's activities have largely remained constant. This Legal Sidebar provides an overview of ICE's authority to conduct arrests and other enforcement actions."
CRS Legal Sidebar, LSB10362
Congressional Research Service: https://crsreports.congress.gov/