An examination of the key moments that shaped President-elect Donald Trump. Interviews drawn from "The Choice 2016" with advisors, business associates and biographers reveal how Trump transformed himself from real estate developer to reality TV star to president.

Reporter Ghaith Abdul-Ahad goes inside the battle against ISIS for control of the city of Mosul. See what's happening in areas where ISIS has been ejected and investigate forces shaping Iraq. Also in this two-part hour: "Hunting ISIS," a dramatic report on an Iraqi unit at the center of the fight.