Guests: Rehema Ellis, Jonathan Dienst, Rep. Chellie Pingree, Jonathan Metzl, Brandy Zadrozny, McKay Coppins, Ellison Barber

Tonight: The latest on the manhunt for the suspect in the Maine shootings that left at least 18 dead. Plus, what can be done about the epidemic of gun violence in America. Then, Mitt Romney’s biographer on the juiciest revelations in his new book. And we go live to the border where Israeli forces have been conducting raids into Gaza.