HARI SREENIVASAN, PBS NEWSHOUR WEEKEND ANCHOR:

Shortly after President Trump took office, Immigration and Customs Enforcement, known as ICE, began arresting hundreds of immigrants in very visible raids across the United States. But as internal ICE documents obtained first by The Washington Post show, half of those detained had either no criminal record or traffic convictions.

Joining me now from Washington to discuss this is one the reporters who broke this story, Maria Sacchetti.

You have a set of data that is around Operation Crosscheck, which is one of the things that we all heard about. How — what did the data reveal and how does that work with all of the larger roundups that have been happening?