Hilsman continued to speak publicly , in print and on television , regarding what he thought should be done in Vietnam , such as in August 1964 , when he warned against over-militarizing the conflict , and in mid-1967 , when he said the war was not politically " winnable " and that the U.S. should scale down its military involvement and stop the ongoing bombing campaign against the North . He consistently maintained that had Kennedy lived , he would not have escalated the war the way Johnson did . Hilsman was an ardent supporter of Robert F. Kennedy and his 1968 presidential campaign , serving as one of the experts advising the younger brother . He was part of a large " brain trust " of advisers to Kennedy during the crucial Democratic California primary in June 1968 ; that eventual campaign victory ended with another assassination
another assassination
Assassination of Robert F. Kennedy
Roger Hilsman