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    Dr. Oz sworn in as Medicare and Medicaid chief

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  • Two people dead, multiple injured in FSU shooting

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  • FSU shooting suspect is sheriff's deputy's son

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DHS task force scouring foreign students’ social media

01:19

A new Homeland Security task force is scouring the social media histories of an estimated 1.5 million foreign students in the U.S. for possible grounds to revoke their visas, three sources familiar with the operation told NBC News. Julia Ainsley reports.