In mid-May, White House deputy chief of staff Stephen Miller, frustrated over what he saw as numbers of arrests and deportations of unauthorized immigrants that were too low, berated and threatened to fire senior Immigration and Customs Enforcement officials if they did not begin detaining 3,000 migrants a day, according to two sources who spoke to attendees.

Miller also threatened to fire leaders of field offices posting the bottom 10% of arrest numbers monthly, the two sources said.

Weeks later, ICE is launching the Trump administration’s largest immigration crackdown.

“Operation At Large,” a nationwide, ICE-led plan already underway to ramp up arrests of unauthorized immigrants, includes more than 5,000 personnel from across federal law enforcement agencies and up to 21,000 Natio

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