He gave the Israelis the bible of American signals intelligence, a manual that shows exactly what foreign (that is, Soviet) signals the United States has intercepted.
The Israeli wanted any leverage they could have over the US. 
mnli hypothesis: The Israeli wanted any leverage they could have over the US.  premise: He gave the Israelis the bible of American signals intelligence, a manual that shows exactly what foreign (that is, Soviet) signals the United States has intercepted.