Assassination Threatens Fate of Iran Nuclear Deal

WASHINGTON — The assassination of the scientist who led Iran’s pursuit of a nuclear weapon for the past two decades threatens to cripple President-elect Joseph R. Biden Jr.’s effort to revive the Iran nuclear deal before he can even begin his diplomacy with Tehran. And that may well have been a main goal of the operation. Intelligence officials say there is little doubt that Israel was behind the killing — it had all the hallmarks of a precisely…