Obama Pushed ‘Fullest Extent’ of His Powers on Immigration Plan

Months before President Obama took executive action last week to reshape the nation’s immigration system, Jeh C. Johnson, the secretary of Homeland Security, quietly convened a small group of advisers to explore the legal limits of the president’s powers.

Working in secrecy, Mr. Johnson’s team huddled for hours daily under orders to use “our legal authorities to the fullest extent” on a new deportations policy, a senior administration official said. In five White House meetings over the summer, Mr. Johnson and Mr. Obama, both lawyers, pored over proposed changes, eventually...