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For the past few months, a single senator \u2014 Tommy Tuberville \u2014 has blocked hundreds of promotions in the U.S. military.\n\nKaroun Demirjian, a congressional correspondent for The Times, explains what\u2019s behind the senator\u2019s blockade, and why military leaders say it\u2019s becoming a threat to national security.\n\nGuest: Karoun Demirjian, a congressional correspondent for The New York Times.