See also the Legal Information Tab/Page on this guide.
Please note that because the Department of Justice and Department of Homeland Security are Executive Federal Agencies, Regulatory Law (found in the Code of Federal Regulations and Federal Register) plays an important role in shaping immigration policy.
In addition, the linked essay may be helpful to understand current (2018-) Logistics and Realities of Regulatory Reforms to Deter Immigrants from Soliciting and Securing Asylum (focused on Central American migrants, but applicable individuals and groups representing other ethnicities and nationalities)