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What do we know about the former hostage negotiator robert c. obrien. >> reporter: good morning, robert obrien the new national security adviser, president trump announcing this on twitter a few minutes ago. our colleague jeremy dimon got if you reporting. a senior official telling him effectively president trump wants a consensus builder and not somebody who is going to start fights. not a show boater. the president, of course, firing john bolton, the former national security adviser saying he ...