president trump's attention. the book is "the great successor," a biography of kim jong-un by a beijing bureau chief. she claims kim jong nam was a cia informant for years before he was murdered. here is how president trump reacted to the information. >> i saw the information about the cia with respect to his brother or half brother, and i would tell him that would not happen under my auspices, that's for sure. i wouldn't let that happen under my auspices. >> joining me is the author, anna phi field. you quote an anonymous source for the explosive tidbit. did you get a sense of why he did it, he just needed the cash? >> i think he did need the cash. after his younger brother kim jong-un became the leader, he seemed to have cut off his older half brother who had been living in exile or kind of quasi exile.