Renewed Push for Immigration Reform After NYC Terror Attack

Administration officials urge Congress to implement a merit-based immigration system

Police stand guard near the New York Port Authority Bus Terminal, the site of a pipe bomb explosion, in New York on Dec. 11, 2017. Drew Angerer/Getty Images

WASHINGTON—The Trump administration is doubling down on its push to end chain migration after a failed terror attack in New York on Dec. 11.

Chain migration occurs when a person immigrates to the United States and in turn sponsors other relatives to join him or her. Those relatives, in turn, can sponsor people, and so on, indefinitely.