By Edward-Isaac Dovere, CNN (CNN) — Rahm Emanuel will declare that “the most important thing a true friend can do is to tell the truth even when it’s painful,” in a speech at Tel Aviv University aimed at forcing a reconfiguration of US policy on unconditional support for Israel. Recalling his own long history with Israel — from going to visit the grave of an uncle who fought for Israeli independence to being called a “self-hating” Jew by Prime Minister Benjamin Netanyahu after an argument during his time as President Barack Obama’s chief of staff — the former Chicago mayor...