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A hearing on tuesday looking into the process of just how a president can hit the big red button, as it were. its the first time congress has looked into the presidents nuclear authority in 40 years. joining me now on set here is jeffrey engel at southern methodist university and author of "when the world seemed new, george h.w. bush and the end of the cold war." the thing that stuck out to me the most, of course, is you learned and you talk at length about george h.w. bushs approach to our nucl...