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https://ondemand.npr.org/anon.npr-mp3/npr/atc/2019/09/20190918_atc_robert_obrien_trumps_new_national_security_adviser.mp3?orgId=1&topicId=1122&d=247&p=2&story=762046380&ft=nprml&f=1003,1004,1007,1013,1014,1015,1017,1024,1025,1026,1059,1122,1150
President Trump's choice for a new national security adviser, Robert O'Brien, has been the point man on American hostages held overseas. He's been a private lawyer punctuated by stints in government.
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