A decision isn't expected to be imminent, one source said, but debate within the administration has shifted recently to more deeply exploring how and when the act might be invoked.

As of the end of August, the whereabouts of two-thirds of more than 1,800 men detained at Alligator Alcatraz during the month of July could not be determined by the Miami Herald.

Social media accounts that appear to be connected to the 16-year-old shooter are littered with references to mass shootings and antisemitic views, The Denver Post found.

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