ESL teachers play important roles in teaching English and cultural orientation to immigrants coming to the US. They serve a variety of people residing legally within the United States such as permanent residents, refugees, migrant workers, asylees, parolees, and some citizens and international students. They also serve undocumented immigrants. Because of the US Department of Education and the Office of Civil Rights anti-discrimination guidelines, teachers are often not informed of their students' legal status. This paper rectifies this information gap about undocumented immigrants by providing information about who they are, why they have come, and what role ESL teachers can play in their education/advocacy. It also explains the impact of conservative and liberal administrations on border enforcement and how the relative open borders of the Biden administration have not only endangered those crossing the border illegally during a pandemic but also the documented immigrants and citizens already in the country.