"Federal immigration laws set forth procedures governing the exclusion and removal of non-U.S. nationals (aliens) who do not meet specified criteria regarding their entry or presence within the United States. Typically, aliens within the United States may not be removed without due process. Commensurate with these constitutional protections, the Immigration and Nationality Act (INA) generally affords an alien whose removal is sought with certain procedural guarantees, including the right to written notice of the charge of removability, to seek counsel, to appear at a hearing before an immigration judge (IJ), to present evidence, to appeal an adverse decision to the Board of Immigration Appeals (BIA), and to seek judicial review."
CRS Report for Congress, R45314
Congressional Research Service: https://crsreports.congress.gov/