WASHINGTON (AP) — John Brennan was headed for the priesthood when, while sitting idly on a bus as a student at Fordham University in the 1970s, he stumbled on a recruiting ad for the CIA. Now, after years of poring through intelligence, trekking with Mideast tribesmen and overseeing some of America's most controversial and lethal counterterror missions, he's pursuing a calling with just as much responsibility and arguably a lot more stress as the nation's top spy.

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