...When asked what the purpose of the call-out for volunteers might signify, the official responded, I cant think of any other reason than preps for processing a lot of expedited removal cases.
Expedited removal is the process for deporting people who have come to the country without the proper paperwork. If individuals in expedited removal ask for asylum or say they fear being returned to their country of origin, they have the right, under U.S. law, to describe their situation before a U.S. asylum officer. If the officer finds that an individuals claim passes a low threshold of credibility, then the case may be heard before an immigration judge. If not, Immigration and Customs Enforcement takes control of the case and deportation proceedings can move forward.
In its domestic immigration enforcement order, the Trump administration said the executive branch will end the abuse of parole and asylum provisions currently used to prevent the lawful removal of removable aliens, raising concerns among some immigration attorneys that asylum seekers could be prioritized for deportation. If thats the case, credible and reasonable fear hearings would need to be held, and detention centers along the border could be one place to start, though it would still be up to individual asylum officers to determine whether detainees pass or fail their screenings.