'The CIA plotted twice to assassinate President Richard Nixon during the years before the Watergate scandal because the agency was angered when 'Tricky Dick' turned dovish and began to withdraw troops from Vietnam, according to an explosive book from a longtime Nixon confidant due for release on Monday. One hit was planned to occur at Nixon's Key Biscayne, Florida vacation house. A second plot to kill him was to culminate during a Miami speech in 1972. When both plots failed, writes best-selling author Roger Stone in 'Nixon's Secrets: The Rise, Fall and Untold Truth about the President, Watergate, and the...