March 17, 2016 The Robert MacNeil Report : Season 41 Episode 55

Thursday on the NewsHour, House Speaker Paul Ryan insists he won’t stand for the GOP’s presidential nomination at the RNC convention. Also: Congress grills officials on Flint’s water crisis, SCOTUS nominee Merrick Garland visits Capitol Hill, controversy over whether college athletes should be paid, SeaWorld stops breeding killer whales and how Silicon Valley is fixing its diversity problem.