President Donald Trump reiterated Friday that federal immigration authorities would conduct mass arrests starting on Sunday. Officials have said the operation will target around 2,100 undocumented families with pending deportation orders.

Telemundo 47 investigative reporter Pablo Guttiérrez says the raids will largely be aimed at people who people who have been issued an order of deportation in absentia. "What that really means," he explained, "is that for some reason they did not show up in court and the judge ordered them to be deported."

The New York Civil Liberties Union has sued, claiming that in many cases the immigrants never received notification they were due in court, and that the agency has a long history of sending notifications to wrong addresses or with incorrect dates or other information.

Meanwhile, advocates for immigrants are warning that the operation could also sweep up other undocumented people who happen to be in the same place, under what is known as "collateral arrests." The New York Times has reported that unnamed homeland security officials have confirmed that the raids would include collateral arrests.

Guttierrez spoke with WNYC's Richard Hake.