PBS NewsHour - Season 41 Episode 45

Thursday on the NewsHour, former presidential nominee Mitt Romney leads the Republican establishment against Donald Trump. Also: A look at the GOP’s deepening schism, scientists hope mutant mosquitoes can stop Zika virus, how the Islamic State is using child soldiers, the glass ceiling drives women away from Wall Street, Diane Rehm talks assisted suicide and Thao Nguyen unleashes the beast within.